Scuba Diving

I was watching this documentary video of Navy SEAL training because I am interested in being a SEAL when I am older,and one part was controlled breathing while coming up from the bottom of the 50ft. dive tower. They came down in this platform like thing that had a half sphere shape around there heads. I am just wandering if that is so they can breathe on the way down. Cuz to me it looked like water would be able to get in. Also, I think that it would be a long time of holding your breath.

Thanks.

Yup, its called a "dive bell", without getting all scientific, the principle is the same as lowering an upside cup into water, a pocket of air becomes trapped inside. The dive bell can move but is usually located at 25 feet from top to bottom. The objective is to release air continuously but gradually out of your lungs as you make your buoyant ascent so your lungs have time to stabilize with the increase/decrease of pressure as you rise/fall. You must make sure you equalize your ears as you rise as well, this can be done by pinching your nose and "blowing" air out through your ears, or by "yawning" but keeping your mouth closed, if someone doesn’t equalize it could lead to an air embolism or even blowing out an ear drum. Good luck.

This entry was posted on Thursday, October 1st, 2009 at 6:14 am and is filed under dive training. You can follow any responses to this entry through the RSS 2.0 feed. Both comments and pings are currently closed.