American Experience

PBS | 9:00 pm

Based in part on a book by Ben Hellwarth, the new episode "Sealab" revisits a daring U.S. Navy program in the 1960s that sought to identify and train a team of "aquanauts" who were physically and mentally capable of spending days or even months working in a pressurized laboratory on the ocean floor. The leader of the team was astronaut Scott Carpenter, who already had achieved fame for being the second American to orbit the Earth.