Episode Details

Half a kilometre deep inside an underwater cave system seems like the ideal place to lose a body. Even so, all the evidence suggested that Ben McDaniel wasn’t inside Vortex Spring – or, at the very least, he wasn’t any more.

This is the ultimate underwater locked-door mystery, featuring debt, deception, and the world's greatest cave diver. This is the story of whether or not Ben McDaniel made it past the ‘end of the line’.

Sources:

https://www.imdb.com/title/tt2293569/

https://www.reddit.com/r/UnresolvedMysteries/comments/9b04lv/ben_mcdaniel_a_scuba_diver_who_vanished_from_and/

https://www.youtube.com/watch?v=QD3p0ToPCrI

https://www.scuba.com/blog/happened-ben-mcdaniel-unanswered-questions/