Yep I think there's plenty of growth/shrinkage creaking from small gaps opening and closing and from structures sliding around on normal metallic subs. But, I b

Yep I think there's plenty of growth/shrinkage creaking from small gaps opening and closing and from structures sliding around on normal metallic subs. But, I bet this sounded different and more terrifying, and was fibers/matrix breaking and cracking. And amplified by the total lack of acoustic materials inside the sub. I thought about this last night and it kept me up a bit. Most of my experience now with carbon, after a little work on structural analysis of layups, has been masts for windsurfing. I've had a couple high performance carbon masts that use 90% carbon and 10% glass break on me. The outer glass is to help against impacts. I've had a case where I heard a little cracking noise then pow, the mast totally collapses into two pieces and I'm in the water. The consequences are usually much much lower when you're on a board floating in water than when underwater thousands of feet down, but the sound in that thing must have been horrible. I want to see his video though.