Through advancements in technology, divers have been able to test the limits of the human body with a technique that allows people to live underwater. It’s a harrowing, sometimes deadly, and exhilarating experience, according to those who have lived it — including our guests Allan Waterfield and U.S. Navy Captain (Ret) Marie Knafelc.Modulus https://twitter.com/modulusmagHostsBrian McManus https://twitter.com/TheBrianMcManusStephanie Sammann https://twitter.com/stephaniesammaSee Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.