Deep: Freediving, Renegade Science, and What the Ocean Tells Us about Ourselves

In the three-dimensional world of the deep ocean, above and below matter as much as in front and behind.

“There are as many ways to breathe as there are foods to eat,” said one female instructor who had held her breath for more than eight minutes and once dived below 300 feet. “And each way we breathe will affect our bodies in different ways.” Another diver told me that some methods of breathing will nourish our brains, while others will kill neurons;

"On land, multicellular life stays pretty close to the surface. But every depth of the ocean is inhabited, in numbers that we are just beginning to appreciate...

"...Comparing the inhabitable terrain of the ocean to that of the land yields a startling statistic: The ocean represents something very close to 99 percent of the biosphere. Spread out as