Even if someone has a pulse-ox or... a monitor, you can breath in certain ways and instantly see what it does to your body. - James Nestor

The less you use your nose, the less you're going to be able to use [it]... When people start habitually breathing through their mouths, their noses are going to start to close...

[T]he more you focus in on these clicks, the tinier... they get, [growing] into more complex structures. ...[O]ther ns such as dolphins and orcas also use these. It's this secret language... discrete codes... down to the millisecond.

During the three minutes beneath the surface... the body bears only a passing resemblance to its terrestrial form and function. The ocean changes us physically and psychically.