As recent submersible tragedies reveal, it’s harder to reach extreme ocean depths than the Moon. Meet the people who got there first—and barely lived to tell to the tale...Our Sponsors:* Check out Rosetta Stone and use my code TODAY for a great deal: https://www.rosettastone.com/Advertising Inquiries: https://redcircle.com/brandsPrivacy & Opt-Out: https://redcircle.com/privacy