Quote Originally Posted by makinen_fan View Post
Answering my own question here. From Appendix J Art 255A:
- Polycarbonate side windows (including rear quarter panel windows) (minimum thickness 3.8 mm). It must be possible for these windows to be removed without the use of tools.

I am not sure how possible it will be to remove them under water though.
There are the small ventilation openings. You catch the glass through this opening and pull. The window brakes. This is how I think it works but I'm not sure.