The salt eaten by ancient people was actually salt from deep wells dug in the ground. Salt produ

[00:00:00]If your left hand [music] plugs the earth, and your right hand gently pulls, you can find deep hidden brine.

[00:00:06]But the brine lies kilometers deep, hard to excavate. So, genius you builds a firm wooden frame on top with a pulley at the peak. One end of a rope goes through, tied to an iron drill bit. The other leads back down.

[00:00:19]Hitched to a foot pedal. Now just keep stepping on the pedal.

[00:00:23]And the bit is yanked up and down.

[00:00:25]Repeatedly smashing through rock. For 10 plus years, it pierces the brine layer.

[00:00:30]Yet the well is a kilometer deep, and old tools fail to fetch the brine. So, you borrow a long bamboo pole.

[00:00:37]Hollow out its joints, and fit a leather check valve at the bottom.

[00:00:41]This way, as the bamboo descends, brine enters through the valve.

[00:00:46]When pulling it up, the valve shuts tight from the weight.

[00:00:50]Thus, the brine is perfectly locked inside. But the filled tube weighs hundreds of pounds.

[00:00:56]Lifting it from a deep well is far beyond human strength. So, you add a winch to the rope end.

[00:01:02]And bring in a neighbor's ox.

[00:01:05]Using ox power to turn it, the heavy brine rises as if on a light string.

[00:01:09]But the retrieved brine has many impurities, requiring fresh soy milk while boiling.

[00:01:15]Soy protein binds with impurities [music] to form solids.

[00:01:19]Which are filtered out repeatedly.

[00:01:22]Until the liquid is pure and clean. As the water further evaporates, snow-white crystals gradually appear.

[00:01:29]This is deep well rock salt.