Life on a Japanese Transport Ship was Worse than Hell

Added: 2026-06-01

[00:00:00]The Imperial Japanese Army described ocean transport as the logistical foundation of the greater East Asia, the co-rossperity sphere. That was the institutional characterization, adequate, accurate, and insufficient to convey what it meant in practice for the 280,000 to 300 00 Japanese soldiers who were moving across the Pacific at any given point in 1942 and 1943 aboard vessels that the Army's transport doctrine classified as temporary operational environments and that the men inside them experienced as the specific combination of heat, confinement, and helplessness that results from placing 800 soldiers soldiers in a ship's hold designed for general cargo in the tropics in a sea where American submarines had been given specific orders to sink everything Japanese that floated. The army's characterization was that the men were being moved. The men's characterization in so far as the records of those who survived preserve it was different in emphasis. They were not being moved.

[00:00:59]They were being placed in a metal container and pointed at an island. The container would arrive or it would not.

[00:01:05]The men inside the container had no instrument for influencing which outcome occurred. Of the approximately 2337 Japanese merchant and military transport vessels in service at the beginning of the Pacific War, American submarines and aircraft sank approximately 2,17 by the war's end. That is a destruction rate that exceeds 90% of the fleet that began the war and accounts for every ship that Japan could build or acquire in replacement. In tonnage terms, the American campaign against Japanese shipping eliminated approximately 8.1 million gross registered tons of transport capacity. More than Japan had at the start, more than Japan's shipyards could replace at the construction rates the war allowed, and more than enough to sever the supply lines connecting Japan to the oil, rubber, ore, and food the home islands required and the island garrisons the army had deployed could not survive without. The soldiers in the holds were a component of this tonnage. They were counted in different columns in different administrative systems, but they went down with the ships the same way the cargo did, without warning, without the ability to fight back, and in many cases without the ability to get out of the hold before the water made getting out no longer a relevant consideration. Before we go any further, subscribe to Steel and Salt right now.

[00:02:23]Every script we produce comes from weeks inside naval records, Army operational reports, and survivor accounts. We do this because these men deserve to have their stories told exactly as they happened with the specific numbers and the human weight that the official histories leave out. When you subscribe, you tell the algorithm, "This content matters. Subscribe." Now, back to the men in the hold. The ships that carried Japanese soldiers across the Pacific were not purposebuilt troop transports in the sense that the term implies dedicated design for human cargo. They were merchant vessels, cargo ships, tankers, ore carriers, freighters operating under charter or requisition to the army or navy transport command whose cargo holds had been modified for troop carrying through the addition of wooden sleeping platforms erected in tiers within the hold space, expanding the number of men the hold could contain in the same way that adding shelves expands the number of boxes a warehouse can hold. The modification was straightforward engineering and it produced a hold that could carry between 400 and 1,000 men in a space previously configured for general cargo with the specific characteristics that the conversion produced. The sleeping platforms were wood laid close together with clearance between tiers of approximately 45 cm, barely enough for a man to turn over without sitting up. The lighting in the hold was minimal, the same industrial lighting that a cargo hold contained because no one had installed purpose lighting for the sleeping areas. The ventilation was what the ship's original ventilation system provided for cargo, which was adequate for keeping raw materials from mildoing and inadequate for what 800 men in a sealed hold in the tropical Pacific produced in terms of heat, carbon dioxide, and biological output. A standard Japanese cargo vessel of the type pressed into troop transport duty displaced between 3,000 and 7,000 tons at full load. She made between 10 and 14 knots. The speed that the ship's original design had specified for cargo hauling, which was not a speed designed around avoiding submarines because submarine warfare against merchant shipping had not been the primary design constraint for Japanese commercial ship building in the 1930s. At 12 knots, a Japanese transport moved at roughly the same speed as an American Liberty ship and shared with the Liberty ship the specific tactical problem that 12 knots is fast enough to cross an ocean and not fast enough to outrun a torpedo running at 46 knots from a submarine that has positioned itself correctly. The transport's armament was what the wartime modification program had added.

[00:04:58]one or two 75mm or 120 millm guns on the stern and bow anti-aircraft mounts of varying caliber and depth charges in some cases. This armament could damage a submarine that was careless enough to surface within range. It could not address a submarine that did not surface. The conditions in the hold during a transit that might last two to three weeks between Japan and the Western Pacific Islands were the conditions that the Army's transport doctrine had established as acceptable and that the men who lived in them experienced in terms that the doctrine had not specified. The temperature in the hold of a cargo ship in the equatorial Pacific was between 35 and 42° C. The military had added sleeping platforms but had not added cooling. The ventilation system moved air through the hold. But the air it moved was the air above the tropical Pacific at 34° with 80 to 90% humidity. And moving it did not cool it. It circulated it, which was different. The circulation distributed the heat and the humidity and the biological output of 800 men in an enclosed space with uniform thoroughess.

[00:06:05]The smell that this produced was the smell that every man who entered the hold after any absence could identify as specific to it in the way that very strong smells are specific, not by component or by analysis, but by immediate recognition as the thing it was. The sleeping platforms provided a surface for each man, allocated in the military distribution that ranked soldiers by seniority for the better positions and assigned the remainder to the available space. The better positions were the ones closest to the hatch, where the air from above occasionally reached, and the ones farthest from the ship's propeller machinery, whose vibration transmitted through the hull, plating into the wooden sleeping surfaces, and through the wood into the bodies of the men lying on it. The men who had been on multiple transits, knew the geometry.

[00:06:51]The men on their first crossing learned it by assignment and by the specific experience of I lying on a wooden plum 45 cm below the man above them in 40° heat in a ship moving through the Philippine Sea at 12 knots, which is to say in a ship producing a motion that the flatbottomed cargo hull transmitted to its contents as a continuous low frequency rocking combined with the higher frequency vibration of the propeller in conditions where the air was already too hot before the additional body heat of 800 men was added to it. Water rationing was the practical constraint that the ship's freshwater system imposed. The freshwater evaporators and tanks on a converted cargo vessel had been sized for the crew of approximately 50 men plus some provision for industrial use.

[00:07:37]The addition of 800 soldiers had not been preceded by the addition of expanded freshwater capacity in most cases because the conversion was performed under time pressure and the transport command's logistics planning had accounted for the soldiers freshwater requirement in the form of an allocation per man per day that was adequate in the planning document and inadequate in the hold in 40° heat when men were losing water through perspiration at rates the planning allocation had not modeled. Men drank their allocation. Men were thirsty after their allocation. The hierarchy of need and distribution in this context resolved itself in the way that it always resolves in small groups under resource pressure. The men with rank and connection did better than the men without it. And the men without it supplemented what they were allocated with what they could obtain from other sources which were limited and managed their thirst the way men manage it when they cannot resolve it. The toilet facilities on a converted transport were the original ship's heads. The crew toilets sized for 50 men, augmented by portable buckets and improvised bucket systems rigged at intervals along the hold space to handle the volume that 800 men produced. This arrangement was documented in army medical inspections of transport conditions in 1942 and 1943 as inadequate by the specific metric of disease transmission risk. Dysentery, chalera, and other gastrointestinal conditions spread more easily through fecal contamination in hot, crowded conditions with inadequate sanitation than in conditions with adequate sanitation. And the army's transport holds provided the first category of conditions at a standard that the medical inspectors documented in reports that were filed, classified, and did not change the transport allocation policy because the transport allocation policy was not set by medical inspectors. It was set by operational requirements and the operational requirement was to move troops to the islands and moving troops to the islands required using the ships available and the ships available had inadequate sanitation for the number of men they were carrying. The information that the men in the hold had about the tactical situation outside the hold was the information the ship's officers and the army commanders deemed appropriate to provide which was generally no information about submarine contacts, minefields, air threats, or the navigational decisions the ship was making in response to them. The reasoning for this information management was not cynical. It reflected a judgment about the relationship between information and morale in an enclosed environment where the recipients of the information had no ability to act on it. A man in the hold who was told that a submarine contact had been reported 20 m to the northeast could not do anything with this information except become frightened.

[00:10:25]And a man who was frightened but could do nothing had no better chance of surviving the subsequent events than a man who was not frightened. The men in the hold were therefore not told about submarine contacts. And they navigated the period between Yokohama and their destination with the information the view from the hold provided, which was the hatch above them, the sleeping platform beside them, and the motion of the ship and the specific quality of interpretation that men in enclosures develop. The reading of changes in engine speed as information about threats, the reading of the ship's maneuvering as information about whether something was out there. the reading of silence among the officers as information that was more specific than any announcement the officers were likely to make. Some men became skilled at this interpretation. Men who had made multiple transits developed a specific sensitivity to the changes in engine character that correlated with the bridgeg's response to contacts or threats. The increase in speed that might indicate a submarine had been reported. The abrupt course change that might indicate an evasive maneuver. the slowdown that might indicate arrival in the patrol area. They could not act on this information in any meaningful tactical sense. They could prepare for what it implied, which meant a specific adjustment of their position relative to the hold's exit, an inventory of what they were carrying that they could take with them, and a decision about what they were not carrying that they were willing to leave. This was the preparation available to a man in the hold who understood that the engine speed had just changed in the way that engine speed changes when the bridge has received a contact report. It was not adequate preparation for the event the preparation was for. It was the preparation available. The Battle of the Bismar Sea on March 1st through 3rd, 1943 was the event that demonstrated with statistical finality what the American Air Force forces in the Southwest Pacific could do to a Japanese troop convoy when weather, surprise, and the specific capability of the skip bombing technique that General George Kenny's fifth air force had developed came together over water where there was no effective fighter cover. A Japanese convoy of eight transports and eight destroyers carrying approximately 6,900 troops of the 51st division from Rabal to Lei, New Guinea was located by Allied reconnaissance aircraft as it passed through the Vitia Strait and attacked over the course of two days by American and Australian bombers using the lowaltitude skip bombing approach that placed delayed fuse bombs skipping across the water's surface to strike the ships at or below the water line. All eight transports were sunk. Four of the eight destroyer escorts were sunk.

[00:13:05]Approximately 3,000 soldiers drowned.

[00:13:08]The survivors were in the water in the Bismar Sea for varying periods. Some were rescued by the surviving destroyers. Some were not reached in time. Some were strafed in the water by Allied aircraft, an action whose authorization and moral status was contested in the immediate aftermath and for decades afterward in the historical record. The survivors who were eventually rescued, some by Japanese submarines, some by destroyers, some by small craft from coastal positions, had been in the water in the Bismar Sea at a temperature of approximately 28° C, warm enough to prevent the rapid hypothermia that the North Atlantic produced, long enough to produce the specific effects of prolonged immersion in warm saltwater exhaustion and the knowledge of what had been in the transports when they went down. The soldiers who survived the Bismar Sea were returned to Rabau. Some of them were returned to troop rosters and assigned to units. Some of them were put on transports again because the army's operational requirements had not changed when the convoy that had been carrying them was destroyed and the island garrisons the army was trying to reinforce still required reinforcement.

[00:14:17]The men who had survived the Bismar Sea were available and had already completed a portion of the movement that their original order specified. The specific sequence of events that killing a Japanese transport at sea produced for the men inside it varied by the ship's structural integrity at the moment of the torpedo hit, the depth of the compartment the men occupied relative to the waterline, the number of exits available, and the time between the first torpedo impact and the point at which the exits were no longer accessible. The time between impact and inaccessibility was sometimes measured in minutes. Destroyers and cruisers that were hit by torpedoes sank over periods that could be as short as 2 minutes and as long as several hours depending on where the torpedo hit and how the flooding developed. A cargo ship with a modified hold full of 800 soldiers hit by a single Mark1 14 torpedo in the midbody near the engine room might lose power immediately. lights out in the hold, propulsion lost, flooding beginning in the machinery spaces, and begin sinking in a period measured in 5 to 15 minutes, depending on how the flooding progressed through the hall's nonwatertight internal structure. In the dark, in the hold, with 800 men in limited exits, the 15 minutes that the structure of the sinking provided was not 15 minutes distributed uniformly across the 800 men. It was 15 minutes consumed disproportionately by the men nearest the hatches and the ladders who were through them first. And the men farthest from them, who were still in the hold when the time ran out. The men who had positioned themselves near the exits were not necessarily the men who had anticipated the sinking. They were the men who had been in the rotation of positions nearest the hatch on that particular night. And the men who had been assigned to the positions farthest from the exits were in them because the army's bunk assignment process had placed them there. And the army's bunk assignment process had not weighted proximity to exits as a factor because the army's transport doctrine had not included the system at Elcal of how quickly any specific class of transport could be evacuated under the conditions a torpedo hit produced. The water that entered the hold when the flooding progressed past the main deck was salt water which was the temperature of the surface water in the Philippine Sea or the Bismar Sea or the South China Sea depending on the route which was between 27 and 30°. The men in the hold who were not near an exit swam in this water in the dark until the water reached the overhead or until they found a way out or until they did not. The Army's records of individual transport sinkings document the survivor counts and occasionally the circumstances of rescue. They do not document the interior of the holds in the period between the torpedo hit and the point at which recording the interior of the hold was no longer possible. One of the men who survived a transport sinking was Private Firstclass Masaru Hayashi of Nagano Prefecture, an inland prefecture where his family had grown up farming rice and where the sea was an abstraction until the army sent him to it. Hayashi was 20 years old when he was conscripted in early 1943, assigned to an infantry unit of the 20th division, and embarked at Moji Harbor in June 1943 on a transport carrying approximate 900 soldiers of the division toward a transit point for New Guinea reinforcement. The ship was a converted cargo vessel of approximately 4,800 tons, converted for troop carrying in the standard configuration that the transport command applied to vessels of this class. wooden sleeping platforms in the two main cargo holds, heads augmented with bucket arrangements, cooking facilities for the military ration in addition to the cruise galley.

[00:17:56]Hayashi had never been on a large ship.

[00:17:58]He had been on riverboats on the rivers of Nagano Prefecture and on the Lake Sua that served the local lake. Neither experience was a preparation for a 4,800 ton converted cargo vessel in the Philippine Sea in June when the typhoon season was beginning to produce the weather systems that the Philippine Sea generated independently of the calendar.

[00:18:19]The ship moved in the swells of the Philippine Sea with the specific motion of a loaded cargo vessel whose flatbottomed hull was shaped for stability rather than comfort. And Hayashi experienced this motion in the hold with approximately 300 other men of his division in the combination of heat and motion and smell that the hold produced on the third day of the transit, by which point the fresh provisions had been consumed, and the smell of the men and the ration and the bucket arrangements had reached the equilibrium that holds with inadequate ventilation reach after several days of continuous occupation. He was assigned to a sleeping platform in the upper tier which positioned him approximately 1.5 m from the hatchcombing above. This was not a position he had selected. It was the position assigned by the sergeant who distributed sleeping spaces on the day of imbarcation. He was there because the sergeant put him there, and the sergeant put him there because Hayashi was young and junior, and the better positions had been allocated to the men with longer service, and the positions adjacent to the hatch were in the upper tier, which the men with options had not chosen, because the upper tier was hottest and received the most air movement from the hatch when the hatch was open, which meant it was also the position most exposed to the elements when the ship was moving in sea conditions that required the hatch to remain ain dogged. The logic of the assignment was the logic of military seniority applied to a geometry that only became operationally significant when the ship was hit. On the 12th day of the transit, the ship was hit by a single torpedo from an American submarine operating in the Philippine Sea. Hayashi was asleep on his platform at approximately 0230. The explosion came from below the waterline on the starboard side amid ships. The concussion woke everyone in the hold simultaneously and extinguished the lighting. The hold was dark. The ship began to list to starboard within approximately 60 seconds of the hit. The list increasing steadily as the flooding in the engine room spaces progressed through the bulkheads that separated the machinery spaces from the adjacent holds. The angle of the list changed the geometry of the sleeping platform tears from horizontal to a slope that the men were now trying to maintain footing on in the dark. The hatch above Hihashi's position was at his level, 1.5 m, which became approximately 1 m reach on the inclined surface and then less as the list increased. He reached the hatch. He opened it, which was possible because the ship's crew had dogged it from inside the ship's structure rather than from the hold side. He went through the hatch onto the main deck. The main deck of a transport ship in the Philippine Sea at 0230 is not a safe environment when the ship is sinking, but it is a different category of environment from a hold that is filling with water in the dark.

[00:21:09]Hayashi went over the side into the water when the list reached the point where the deck was at approximately a 30° angle to the the water and the distance to the water was manageable. He was in the water for approximately 2 hours before a Japanese destroyer that was part of the convoy escort reached his position. He was one of approximately 180 survivors from the approximately 900 soldiers who had been aboard. The remainder had been in positions in the hold from which the progression of the sinking had not allowed exit. The destroyer that recovered him brought him to the transit point that had been the convoys destination. He was assessed by the army medical officer as physically fit for duty. He had swallowed seawater. He had cuts on his hands from the hatch fittings. He was 19 hours behind the movement schedule that his unit's operational orders specified. The army reassigned him to a replacement draft and put him on another transport. He arrived at his assigned position in New Guinea approximately 3 weeks late. The operational records do note the delay as significant. The arrival of a private first class at his assigned unit is not the category of information that operational records give extended attention. Hayashi served in New Guinea through 1943 and into 1944. He survived the New Guinea campaign in ways that the New Guinea campaign permitted survival by not being in the specific position on the specific day when the American forces reached it. by being wounded in a way that the field hospital could treat and that he recovered from by the specific accumulation of circumstance that determines who survives campaigns with high casualty rates and who does not. He was evacuated to the Philippines in late 1944 as the New Guinea garrison was withdrawn. He survived the Philippines campaign. He surrendered with the Philippine garrison in August 1945 and was repatriated to Japan in 1946. He returned to Neagano Prefecture where his family was farming the same rice fields they had been farming when he left. He worked the farm for the rest of his active life, eventually handing the operation to his son. He did not travel on ships voluntarily after the war. This was not a phobia documented by a physician or a condition discussed in any medical or veterans record. It was an observation his family made and noted in the way families note the things that changed in a man who went to war and came back and did not discuss what had changed. His granddaughter in an account she gave to a Nagano regional oral history project in 2001 said her grandfather had told her one thing about the ship. One thing across all the years between 1946 and the early 2000s when the oral history project reached him.

[00:23:50]across all the family occasions when the topic of the war came up in the way that topics come up in families where a member served and survived. He had told her that the hold was dark after the hit. Not that it was frightening, not that men were drowning around him, not that he had been lucky to be near the hatch, or that the specific geometry of his sleeping assignment had been the thing that made the difference between the 180 who came out and the 720 who did not. He had told her that the hold was dark. She had asked him what he meant, and he had said that when the lights went out in the hold, it was a dark that was different from normal dark. It was the dark of a sealed enclosed space below the waterline with no external light source and no sky. He said, "You understood very quickly in that dark that the only thing that mattered was which direction was up, because that was the direction the exit was." He said he had found up and gone toward it and had been one of the ones who reached it. He said that was the story. He died in 2006 at the age of 83. He had farmed the rice fields of Nagano Prefecture for 60 years and had not been on a large ship again.

[00:24:55]His granddaughter said there was a small lake near the farm where the family occasionally went in the summer and that her grandfather would sit at the edge of it and watch the water as old men watch water and that she had once asked him if he liked the lake and he had said it was fine because it was shallow and he could see the bottom from the shore. She had not understood what he meant when he was alive. She understood it when she was telling the story to the oral history interviewer. The hold was dark. He had found up he had lived. The lake was fine because it was shallow. That is what it cost to be on a Japanese transport ship during the Second World War. Not the tactical designation, the logistics component, the troop carrier, the expendable hull in the army's movement tables, but the wooden platform in the hold at 40°, the bucket arrangements, the engine speed changed that men who had been on enough transits had learned to read as information about what was outside and the dark that came when the lights went out, and the only thing that mattered was which direction was up. The destroyers died fighting. The transports died without being able to fight. The men inside them died with the specific knowledge that the outcome had been determined before they went aboard. In the planning offices, where the transport doctrine and the submarine threat and the arithmetic of 800 men in a cargo hold had been assembled into operational orders that described their movement and did not describe their odds. Some of them found the hatch in the dark. Some of them found a lake they could see the bottom of from the shore.

[00:26:26]Most of them are in the 8.1 million tons. They are counted in different columns than the men on the destroyers and the cruisers and the battleships.

[00:26:35]They were always counted in different columns. They are still in the