Airplanes are not crushed though, they actually are overpressurized compared to their environment. In any case, the level of pressure differentials is huge comp

Airplanes are not crushed though, they actually are overpressurized compared to their environment. In any case, the level of pressure differentials is huge compared to a sub. In any case, I'm a basic scientists, so it's all I know about carbon fibres. Seems like a weird choice to start a composite with that needs to deal with pressure, love to be educated!