Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 14 - Think and Explain - Page 279-281: 65


We do not "suck" air into our lungs, but rely on creating a lower pressure region there so that atmospheric pressure pushes air in. (Your favorite search engine can refer you to how the diaphragm works to expand the lungs.) When you are submerged, your body is compressed, along with your lungs and the air within them. This makes it difficult to expand the lungs to create that low-pressure region, and for humans, the difficulty begins at about 1m of depth.
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.