In the last unexplored territory on earth, a new world record is being set this summer…
Deep in a flooded cave system in northern Spain, some of the best divers in the world will be attempting the world’s longest cave dive.
Going further into the cave than Everest is high, more than 8.825km. (5.4miles). It’s easier to get to space than the end of this cave and less people have been here than have landed on the moon.
They will have to stop to decompress for hours at a time along the way and sleep in air spaces they find as they dive.
This is such an extreme expedition, that they will have to design and develop their own kit. Nothing can afford to fail. Rescue is not an option.