quote:

Originally posted by sigfreund:
For everyone who believes that there should be a way of opening the exit way from the inside, what would be capable of permitting that while also withstanding the enormous pressures at depth? Bolt heads on the inside? How would entrance be made from the outside if necessary? Two portals?

quote:

Originally posted by CaptainMike:
Nowhere have I seen addressed the dissimilar compression characteristics of dissimilar materials, carbon fiber tube, titanium end caps, god know what else. This is a major factor when operating at depth and would be my first stab at a point of failure for this design.

quote:

The founder of the company whose submersible became lost on a dive to view the wreckage of the Titanic, sparking a frantic, deep-sea rescue effort that has riveted people around the world, once declared he didn’t want to hire “50-year-old white guys” on his team even if they were seasoned submariners.

… Stockton Rush, CEO of OceanGate Expeditions, is aboard the submerged vessel along with billionaire explorer Hamish Harding, French explorer Paul-Henry Nargeolet, and British businessman Shahzada Dawood and his son, Suleman. Since the 22-foot craft lost contact with the surface early Sunday, critics have come forward to blast the company’s safety practices. But Rush was previously adamant that he values youth over experience when it comes to assembling his crews.

“When I started the business, one of the things you’ll find, there are other sub operators out there, but they typically have gentlemen who are ex-military sub-mariners, and they — you’ll see a whole bunch of 50-year-old white guys,” Rush told Teledyne Marine representatives before the expedition began. Teledyne Marine made the sonar systems and the navigation systems for the vessel.
“I wanted our team to be younger, to be inspirational,” he continued. “And I’m not going to inspire a 16-year-old to go pursue marine technology, but a 25-year-old who’s a sub pilot or a platform operator, one of our techs, can be inspirational. So we’ve really tried to get very intelligent, motivated, younger individuals involved because we’re doing things that are completely new.”

quote:

Originally posted by kkina:

quote:

Originally posted by sigfreund:
For everyone who believes that there should be a way of opening the exit way from the inside, what would be capable of permitting that while also withstanding the enormous pressures at depth? Bolt heads on the inside? How would entrance be made from the outside if necessary? Two portals?

Actually I think it would be possible to design 2-way access on a single portal. An outer sealing plate and an inner sealing ring sandwiched between the outer plate and the hull.

The outer plate would be bolted from the outside; it attaches only to the inner ring. The ring is bolted from the inside. In an emergency, the crew could remove the inner bolts and detach the entire sealing unit from the inside.


2-Way Hatch by kpkina, on Flickr

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quote:

I believe this is what Fly-Sig was describing on the previous page, though with a different kind of release on the inside.

Makes sense.

quote:

Originally posted by kkina:

quote:

Originally posted by sigfreund:
For everyone who believes that there should be a way of opening the exit way from the inside, what would be capable of permitting that while also withstanding the enormous pressures at depth? Bolt heads on the inside? How would entrance be made from the outside if necessary? Two portals?

Actually I think it would be possible to design 2-way access on a single portal. An outer sealing plate and an inner sealing ring sandwiched between the outer plate and the hull.

The outer plate would be bolted from the outside; it attaches only to the inner ring. The ring is bolted from the inside; it attaches only to the hull. In an emergency, the crew could remove the inner bolts and detach the entire sealing unit from the inside.


2-Way Hatch by kpkina, on Flickr

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Pretty good job using BIC CAD process

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Originally posted by CaptainMike:
Alvin (6500 meter rated depth) and other deep submersibles have been using taper fit hatches, easily operable from the inside (3 lug wheel engagement) since the 1960's, probably much earlier.
You guys are trying to reinvent the wheel.

Think of how a rifle bolt engages with a chamber, in this case with a taper, because the pressure is pushing from the outside in, rather than the inside out.

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Originally posted by oddball:
And for my limited knowledge, carbon fiber has great tensile strength, but subpar in compression strength.

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Originally posted by PASig:
One thing I haven’t seen anyone discuss here is the fact that, even if they were somehow grapple them and drag them to the surface with enough air left, what about the bends?


Wouldn’t they need to be brought to the surface slowly?