I'm a cyclist. People DO worry about the failure mode of carbon fiber when riding, and the stakes in bicycling are FAR LOWER -- I mean, you'll almost certainly live.

From the factory it's gonna be fine, but the worry people have is getting a nick or dent in it in such a way that it compromises the strength in an important dimension. Carbon fork failures used to be a thing, and that can end REALLY REALLY BADLY for a rider on a road bike.

So going deep enough that a vessel failure means effectively instant disintegration in a carbon sub? F*ck no, like, on the face of it.