Melissa Armstrong and David Tomlinson set out to have an easy 30 minute dive around an active volcano. But when unexpected bad weather caused stronger currents, they were pulled way off course. When Melissa and David resurfaced, they were much farther from the boat than planned, which made them impossible to spot. The two were then left out in the middle of the ocean to fend for themselves. The divers had to endure dehydration, a twenty mile swim, and all the sea life between them and the land.