Extremely detailed article.......Very informative.....
‘I don’t want to be tattle tale, but I’m so worried he kills himself and others.’ Ex-OceanGate employees exchanged emails about Titan sub dangers and the CEO’s ‘quest to boost his ego’
Interviews and e-mails with expedition leaders and employees reveal how OceanGate ignored desperate warnings from inside and outside the company. “It’s a lemon,” one wrote.
www.newyorker.com
The Titan’s viewport was made of acrylic....Could be a factor
It seemed as if Rush believed that acrylic’s transparent quality would give him ample warning before failure. “You can see every surface,” he said. “And if you’ve overstressed it, or you’ve even come close, it starts to get this crazing effect.”
“And if that happened underwater . . .”
“You just stop and go to the surface.”
“You would have time to get back up?” Pogue asked.
“Oh, yeah, yeah, yeah. It’s way more warning than you need.”
John Ramsay, who has designed several acrylic-hulled submersibles, was less sure. “You’ll probably never be able to find out the source of failure” of the Titan, he told me, in a recent phone call from his cottage in southwest England. But it seems as though Rush did not understand how acrylic limits are calculated.....
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“With titanium, there’s a purpose to a pressure test that goes beyond just seeing whether it will survive,” John Ramsay, the designer of the Limiting Factor, explained. The metal gradually strengthens under repeated exposure to incredible stresses. With carbon fibre, however, pressure testing slowly breaks the hull, fibre by tiny fibre. “If you’re repeatedly nearing the threshold of the material, then there’s just no way of knowing how many cycles it will survive,” he said.
The submersible Antipodes at the OceanGate headquarters, in Everett, Washington, on July 19, 2017.
David Lochridge, OceanGate’s former director of marine operations, pilots Cyclops I during a test dive in Everett, on July 19, 2017.
Stockton Rush inside Cyclops I, on July 19, 2017.
Various models of Cyclops II are exhibited alongside a model of the Titanic, at the OceanGate headquarters, on July 19, 2017.