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For Lockridge, the engineer, this has got to be the worst feeling. He was right, he tried to stop it and was fired and sued for his well founded concerns.

The fact that it didn't have a surface radio beacon or bottom sonar beacon is astounding. The CEO really did cut corners that cost him and his customers lives. What other corners did he cut? What possessed him to use carbon fibre for the main hull?

Old retired Engineer here, mostly worked in Aerospace. I think you covered this very well. I would like to touch on 2 points if I may.

The thing I find the most unforgivable, is that the son didn't want to go, but he felt pressure to please his dad, and went. That's what's the real tragedy.

The hull was made of two different materials, carbon fiber and titanium. I would assume that those materials deform differently under such extreme pressure. Wouldn't that create a huge additional risk of failure at the joint between them?

NDT inspector here. Great explanation. I'm absolutely floored no stress testing was done after every use.

The fact that man was fired & sued for doing his job & being genuinely concerned is appalling.

It's a cemetery not a circus attraction. I'm sorry for the lost and their loved ones but it shouldn't be a tourist attraction.

You are right about the issues with carbon fiber. My father worked in aerospace, and most of what he designed is still classified so I've heard about very little of it aside from a few satellites as they were declassified and parts he worked on for the shuttle. He mentioned the issue with carbon fiber after the roof of several airplanes tore free in Hawaii. Carbon fiber cracks from the inside out and is incredibly difficult to examine unless you have the proper equipment Metal tends to show signs of surface deterioration, so one can often determine that there is an issue.

I’m not an engineer but I think conscientious engineers just got a lot more respect and appreciation!