Here's Suzie giving me the "thumbs up" sign.

Our "conversation" immediately preceding, went something like this...

Suzie (in her best underwater sign-language):
"There's somethin fishy goin on here...
Frank, our instructor, says we've gotta go up now.
RIGHT AWAY!

Lynnette (clueless as ever about this whole SNUBA thing):
What?! Uhhh.... Woah!... wait for me!

As it turned out... Frank was actually signaling 3 fingers to Suzie, as in: "You only have 3 minutes of air left!"

THAT was a weird feeling! We both reached the surface in the nick of time. Our tank was DRY...