(This program is no longer available for streaming.) Follow a fearless team of scientists as they venture into blue holes—underwater caves that formed during the last ice age, when sea level ...

Cave divers are at the forefront of this research, helping us access some of the deepest and darkest subterranean and water-filled parts of our planet. Take a deep breath and dive below the surface ...

Watch as divers locate fossils in blue holes—from crocodiles, owls, tortoises, birds, and more—species that are now extinct in the Bahamas and some of which have never been recorded in science ...