#5 What's that coming out of his ear?Katy Perry of Martinez, Calif./

Pictured from left to right clockwise: Athletes Anson Henry, Kareem Streete-Thompson (Cayman Islands), Tim Montgomery, Marion Jones and PADI diving instructor David Koenigsberg of Red Sail Sports.Related ...

#2 He keeps saying, "Nice bottom... uh, time."Ken Carter of New York, N.Y.

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Exhale slowly. The air in your lungs expands as you ascend, and it's not uncommon to exhale all the way up and reach the surface feeling you have more air in your lungs than when you began the ascent. You're a good diver. You could be ...

#4 Ken would have to investigate all of Bill's past buddies.

We all know the rule: "Look, Don't Touch." But just in case...

Scuba Lab tested 13 jacket-style BCs and found that sometimes less really is more.

Measuring dive time, depth and air supply, it uses a reliable, time-proven algorithm to calculate and display remaining dive time based on established limits for nitrogen tension, oxygen exposure or cylinder pressure.