It's the only rock we eat, and we need it to live. History has shown that those who have salt rule the world--and today, this versatile substance has 14,000 known uses. Travel to a salt mine 1,800 feet below Lake Erie where workers blast salt from a massive deposit spanning four states, to an evaporation facility near San Francisco where machines harvest salt from the briny ocean. Visit a Florida restaurant that offers 40 different varieties of salt...and journey to New York to explore salt's surprising number one application: de-icing snowy winter roads. See how a high-tech desalination plant removes salt from ocean water, producing 25 million gallons of drinkable water every day. And if it's speed you're after, look no further than a natural drag strip in Utah made of pure salt.

A gritty, true-life series exposing the world of history's most notorious and dangerous gangs.

A gritty, true-life series exposing the world of history's most notorious and dangerous gangs.

The explorers arrive at the Bahi Swamp--despite its name, a harsh desert landscape. While there, they arrange to hire donkeys to help carry supplies for the next stage of the trip. The plan is to beat the heat by setting out at 4am, but things don't work out as planned. As the sun is hitting its peak, the explorers see the massive stretch of desert awaiting them: HOT--no shade, no protection and a long way to go. The philosophical divisions between some of the group manifest themselves in physical separations. When they all reunite, trouble brews. At camp later in a village, the team temporarily irons out their differences--but again, they seem to only patch things up on the surface. After two days of trekking across the swamp, the expedition runs into a massive incline they will have to climb. Again, arguments about how to proceed develop. When the team finally makes it to the top, a fight ensues. They may have made it through that leg of the expedition, but are they together?