Related to this, the Hydraulic Press channel did a somewhat similar implosion test of a composite tube with metallic ends. Thought it was relevant due to other discussion on this topic:
As a lot of the comments talk about, it visually looks [1] like the glue failed and there's no provided evidence that a submersible would use the same 2 part epoxy glue.
My understanding was for that "submersible" the glue never had a seal in the first place. But I can see the argument that instead the glue failed early on.
> The high velocity/high deformation collapse inward would probably cause any bond line or the fibers in that proximity to fail anyway?
Well, my overall point is that there is no evidence that the test is an accurate reproduction/simulation of Titan. Honestly a better test is probably just having carbon fiber on "dry-land" and pushing on sheet of it using the press at a known pressure so see if at 400 atms it just deforms or breaks. The whole point of it being a submersible test is to ride the curtails of the deaths (i.e. entertainment not education).
Anyways, the carbon fiber definitely deforms but the glue failing is a very fast shock that precedes the implosion. Surely the carbon fiber would've broke when more force was applied (assuming the glue didn't). But I think the test only showed the breaking point of the epoxy.
If you're testing submerssibles and one of them has (>5% maybe less) deformation that should count as a test failure. But that deformation doesn't count as an implosion.