I've linked this elsewhere in thread, but here's testing results from a US Navy pilot project for carbon fiber unmanned subs. It looks like this found it pretty

I've linked this elsewhere in thread, but here's testing results from a US Navy pilot project for carbon fiber unmanned subs. It looks like this found it pretty viable. https://apps.dtic.mil/sti/pdfs/ADA270438.pdf https://apps.dtic.mil/sti/pdfs/ADA270438.pdf