Holy cardio batman

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I went to my very first spin class this morning at the gym. I swear that lady was trying to kill me...I do feel great now though! I will definitely be going again. I've been assured it's an OK workout for my knee and I've already been biking so I figured it was a good place to start.

This sounds wierd I know, but I'm trying to figure out if I can wear my heart rate monitor in the pool. I know the watch part is waterproof, but I'm curous if the Polar F4 heart rate monitor chest strap can be used underwater. It'd be rediculously cool to see how I do swimming heart rate wise, but I don't want to wreck the little robot...it's a fun toy. Anyone know if you can?? I'm geekily curious...