I read his book awhile ago, or at least I read one about competitive free diving, which also included quite a bit about the physiology. I really loved this video piece because it takes the transcendent components of free diving and combines with this unprecedented way to be in communion with marine mammals. Thanks OP!

One of the coolest things I've seen in a long time. Sperm whales, despite the unfortunate name, are so beatiful.

they are really cool, and their biology is extraordinary!