Yes, my instructor has shown underhooks - I just suck at them.
The guy last night was killing me by blocking my hips and trapping my legs very effectively. He was also good about flattening my shoulders out so I coulsn't roll in any case. I actually gassed out right before the match ended because he was crushing my chest so bad.
Wish I had wrestled in high school, but I was doing kroddy then, and didn't think I needed it. I did use the 'stand up' out of guard a few times last night to good effect.