Jess, Martin and Stu regularly dive to 200 metres under the North Sea to satisfy our insatiable desire for oil. They live for a month in a tiny metal chamber in the heart of a ship, under pressure, so they can make regular excursions to the sea bed without suffering decompression sickness. Breathing a helium/oxygen mix and travelling to the sea bed in a diving bell that looks like a space ship, the trio exist in a bizarre and remarkable world that has rarely been seen before.