Quote:
Originally Posted by Rawknees'Turbo
I'm absolutely dumbstruck by the glue application indicated in that vid; anyone who has ever used two part adhesives or resins, applied them in open air by hand (bondo spreader, or similar) and then later broken a cured piece of it off, can see all kinds of air bubble pockets in it, even if care was taken to not stir a bunch of air in during mixing. Had I been on the assembly crew for that submersible, and was handed a hand spreader, intended to be used in the manner the pics in the video indicate, and been told to have at it, I would have laughed and said, "You've gotta be shiitin me, really?".
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But it was
"designed by an engineer!" 
So anyway we wont really know what happened until they recover the wreckage and complete an investigation.
Coincidentally this failure reminded my of the The Challenger Disaster O-Ring failure. Not the same thing but again designed by engineers.
https://en.wikipedia.org/wiki/Space_Shuttle_Challenger_disaster