re: Titanic tourist submarine goes missing

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Again, if the reports that this sub made at least a dozen dives to that depth with everyone making it back fine, how can anyone say the composite material wasn't a viable material? They literally have real world proof that it was.

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It might help you to watch Cameron's explanations -- in his own words he said composite material is insidious in that it lulls you into thinking it's "viable material" --

Cameron's Explanation - 4 minutes

You're talking about decommissioning something after 25 dives -- He mentions that contiguous material like steel can last potentially 1000 cycles -- regardless of what the number is -- they have ways of measuring what the yield is and when to decommission.