9) You look back at your logbooks and realize you've spent more time at decompression than work.
Barrett Christie of Galveston, Texas

8) You're permanently prune-fingered.
SCBD of Tucson, Ariz.

7) Your dive log is available on Amazon.com.
Kyle Howard of Houston, Texas

6) You have named all the zebra mussels on your favorite wreck.
Mike & Vanessa of Toronto, Ont.

5) You worry that your office elevator is ascending too quickly.
Rich Lockyer of Chino, Calif.

4) You've stopped logging your dives because it's easier to just log your surface intervals.
Kurt Busch of Foster City, Calif.

3) Your "time to fly" is measured in months.
George of Seattle, Wash.

2) Your picture appears on fish identification tables.
Michael Jilek of River Falls, Wis.

1) You perform a Valsalva maneuver prior to stepping on a down escalator.
Dennis Grace of Austin, Texas

10) You have to put your total number of dives in scientific notation.
Patrick Bellamy of Atlanta, Ga.