>>Elegent solution: Center punch. I have manual windows, but I also have a center punch an unsurance (it's actually not in my Jeep right now... :-/ ) It will instantly pop out a side window.<<
Have you tried that with a window that's actually under water? There would be a dampening effect (no pun intended!). I wonder if a center punch, without a hammer behind it, would be sufficient with a water dampener on the other side. Fill a glass with water and tap on the bottom of it - you'll feel the energy being smoothed out through the whole viscous mass....