How One Ship Carries Thousands of Containers

Added: 2026-05-22

[00:00:00]At the Port of Los Angeles, a ship the length of four football fields slides into the harbor.

[00:00:06]It's carrying 24,000 metal containers stacked [music] 14 stories high.

[00:00:12]And it just crossed the entire Pacific Ocean to get here.

[00:00:16]That's over 200,000 tons of cargo moved by an engine the size of a house >> [music] >> crewed by just 25 people.

[00:00:25]How does a structure that massive stay balanced, navigate [music] thousands of miles of open ocean, and unload in under 24 [music] hours?

[00:00:35]That's what we're covering right here on Simple Why.

[00:00:40]Back in April 1956, a trucking entrepreneur from North Carolina named Malcolm McLean loaded 58 metal boxes onto a converted tanker ship called the Ideal X, and sailed it from Newark, New Jersey to Houston, Texas.

[00:00:59]Nobody paid much attention at the time.

[00:01:01]It looked like a minor logistics experiment. What McLean had actually done was solve one of the oldest problems in shipping.

[00:01:11]Before his idea, moving cargo by sea meant thousands of individual items, crates, barrels, sacks.

[00:01:19]Each one handled by hand, piece by piece.

[00:01:23]Loading a single ship could take a week or more. Labor costs ate up most of the profit.

[00:01:29]Theft was constant because loose cargo sitting on a dock was easy to pick through.

[00:01:34]McLean's insight was that the box itself should be the unit. Not the stuff inside, the box.

[00:01:43]Standard dimensions, standard fittings, compatible with trucks and cranes and ships all at once.

[00:01:52]By the mid-1960s, the idea had spread to major ports around the world.

[00:01:57]Today, around 90% of all general cargo on Earth moves inside one of those standardized boxes, officially called a TEU, a 20-ft equivalent unit.

[00:02:09]That one decision reshaped the entire global economy.

[00:02:13]And honestly, it's hard to overstate how much.

[00:02:18]To understand why ships this large exist at all, you have to look at what global trade actually demands.

[00:02:25]By the 1990s, consumer goods were being manufactured in Asia at a scale that older ships simply couldn't handle efficiently.

[00:02:35]More voyages meant more fuel, more crew costs, more port fees. Shipping companies needed fewer trips carrying more cargo each time.

[00:02:45]The answer was to go bigger, much bigger.

[00:02:50]Without vessels capable of carrying tens of thousands of containers per voyage, the price of everything you buy, electronics, clothing, furniture, would be noticeably higher.

[00:03:02]The Port of Los Angeles alone handles around 10 million TEUs per year.

[00:03:08]Without ships large enough to move that volume efficiently, that throughput would require far more vessels, far more fuel, and far more time.

[00:03:18]So, the mega ship wasn't built because engineers wanted a challenge. It was built because the math demanded it.

[00:03:30]When we looked into how containers are actually loaded, the answer was more precise than we expected.

[00:03:36]It's not dock workers eyeballing space and stacking boxes wherever they fit.

[00:03:41]Hours before a ship arrives at port, computers on land calculate the exact position of every single container, all 24,000 of them.

[00:03:52]Weight, destination, and the ship's balance all factor in simultaneously.

[00:03:59]Heavy containers go at the bottom.

[00:04:01]Lighter ones go higher.

[00:04:04]Cargo is distributed evenly between the left and right sides, >> [music] >> called port and starboard, and spread across the full length of the ship.

[00:04:13]If the center of gravity drifts even a few meters off, the ship starts to list.

[00:04:18]To counter this, every container ship carries ballast tanks, large compartments built into the hull that can be filled with or drained of seawater to shift the ship's weight as needed.

[00:04:32]Stability software monitors the ship's tilt continuously and adjusts automatically.

[00:04:38]The engine that drives all of this is itself a structure worth stopping to think about.

[00:04:45]The largest container ships run on two-stroke diesel engines standing between 43 and 56 ft tall, and weighing over 2,200 tons.

[00:04:56]Per ton of cargo moved, a container ship uses roughly 10 times less fuel than a truck, and about 100 times less than a cargo plane.

[00:05:06]That gap is why maritime shipping still dominates global trade.

[00:05:11]That efficiency works right up until something goes wrong.

[00:05:18]The fuel numbers alone don't explain everything.

[00:05:21]Engineers have spent decades shaping the hull itself to reduce drag.

[00:05:25]The bow is cut sharp to slice through waves rather than push them aside.

[00:05:31]The underwater section curves in ways that reduce turbulence and vibration.

[00:05:36]The MSC Arena, launched in 2023 and currently the world's largest container ship, uses an air lubrication system that pumps bubbles along the underside of the hull, reducing friction with the water.

[00:05:52]That system alone cuts fuel consumption by around 3 to 4% compared to a conventional hull.

[00:05:58]You'd think those small percentages don't add up to much.

[00:06:02]But a single voyage from Shanghai to Rotterdam burns somewhere between 7,500 and 9,000 tons of fuel.

[00:06:12]3% of that is a real number.

[00:06:15]Multiply it across a fleet of dozens of ships making dozens of voyages per year, and the savings become significant.

[00:06:24]Both financially and in terms of emissions.

[00:06:30]On March 23rd, 2021, a container ship called the Ever Given entered the Suez Canal heading from China to the Netherlands.

[00:06:40]A sandstorm dropped visibility. A gust of wind caught the hull, and within minutes the ship had gone sideways.

[00:06:49]Wedged bow first into one bank, stern into the other.

[00:06:54]Nearly 1,300 ft, 400 m, of steel completely blocked the canal.

[00:07:02]12% of all global maritime cargo passes through the Suez Canal. Within days more than 400 ships were waiting on either side.

[00:07:12]Maersk, one of the world's largest shipping companies, reported direct losses of $89 million from that single incident.

[00:07:21]Factories in Europe started running low on components.

[00:07:25]Delivery timelines shifted by weeks.

[00:07:28]A tiny excavator on the bank became one of the most shared images on the internet that week.

[00:07:34]People thought it was funny.

[00:07:36]The supply chain did not.

[00:07:41]The biggest challenge facing container shipping right now isn't size.

[00:07:46]It's fuel.

[00:07:47]Heavy fuel oil, which most of these ships still burn, produces significant sulfur emissions.

[00:07:54]International Maritime Organization regulations introduced in 2020 require ships to either switch to cleaner fuels or install exhaust scrubbers.

[00:08:04]Some newer ships now run on liquefied natural gas.

[00:08:07]A smaller number are being designed around ammonia, which produces no carbon dioxide when burned.

[00:08:14]Though fuel infrastructure at ports is still early stage.

[00:08:18]So, the next time you track a package and see it sitting somewhere in the Pacific Ocean, there's a lot more going on than you'd think.

[00:08:25]That box is one of 24,000 aboard a ship loaded by computer, balanced by algorithm, and crewed by about 25 people crossing an ocean.

[00:08:36]The whole system runs on margins so tight that one stuck ship in one canal can delay your order by weeks.

[00:08:44]What part of this surprised you most?

[00:08:47]Drop it in the comments.

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[00:09:00]Thanks for watching Simple Why.