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He's on the bottom right now. Latest @jimcameron tweet: "Just arrived at the ocean's deepest pt. Hitting bottom never felt so good. Can't wait to share what I'm

He's on the bottom right now. Latest @jimcameron tweet: "Just arrived at the ocean's deepest pt. Hitting bottom never felt so good. Can't wait to share what I'm seeing w/ you @DeepChallenge"

michael_nielsen 14y ago
Awesome! According to @PaulGAllen, they hit at 0752 local time, and "all systems ok"!
- yew 14y ago
  @PaulGAllen: Pressure at bottom is 16,285 Pounds per square inch at that depth. Design pressure was 16,500 ...Yikes/Amazing! Amazing that it is working. The engineering must be interesting. Edit: Apparently the DC weighs a tenth as much as the Trieste (the original bathyscaphe), including all the instruments. Less than a lifetime. . .
  - evoxed 14y ago
    Just read that too. That's not much of a safety factor! Still, it's quite a feat and I hope it continues smoothly.
    - JshWright 14y ago
      It's quite likely that the 16,500PSI rating is accounting for the safety factor.
      - evoxed 14y ago
        You're probably right– at least, I hope you're right. Looks like everything went as expected though, so congratulations to everyone who worked on it. Still waiting to see what they collect...
      - snarf 14y ago
        16,500 PSI was just what it was tested at, and it could apparently withstand significantly greater pressure than that. From the Deep Sea Challenge website: "The hull, complete with its hatch and viewport, was tested twice in a pressure chamber at Pennsylvania State University to an equivalent full-ocean-depth pressure of 16,500 pounds per square inch (1,138 bars). It passed both tests. Twenty-two strain gauges attached to the sphere gave data that indicated the sphere could withstand up to 140 percent of the test pressure without buckling."
  - elithrar 14y ago
    > @PaulGAllen: Pressure at bottom is 16,285 Pounds per square inch at that depth. Design pressure was 16,500 ...Yikes/Amazing! Amazing that it is working. The engineering must be interesting. I'd love to see a dissection of the submersible once they bring it back up. It'd be interesting to see if there were any seal or structural failures.
  - HeyLaughingBoy 14y ago
    Essentially no safety margin. I wonder what's normally considered reasonable.

He's on the bottom right now. Latest @jimcameron tweet: "Just arrived at the ocean's deepest pt. Hitting bottom never felt so good. Can't wait to share what I'm seeing w/ you @DeepChallenge"

michael_nielsen 14y ago

Awesome! According to @PaulGAllen, they hit at 0752 local time, and "all systems ok"!

yew 14y ago
@PaulGAllen: Pressure at bottom is 16,285 Pounds per square inch at that depth. Design pressure was 16,500 ...Yikes/Amazing! Amazing that it is working. The engineering must be interesting. Edit: Apparently the DC weighs a tenth as much as the Trieste (the original bathyscaphe), including all the instruments. Less than a lifetime. . .
- evoxed 14y ago
  Just read that too. That's not much of a safety factor! Still, it's quite a feat and I hope it continues smoothly.
  - JshWright 14y ago
    It's quite likely that the 16,500PSI rating is accounting for the safety factor.
    - evoxed 14y ago
      You're probably right– at least, I hope you're right. Looks like everything went as expected though, so congratulations to everyone who worked on it. Still waiting to see what they collect...
    - snarf 14y ago
      16,500 PSI was just what it was tested at, and it could apparently withstand significantly greater pressure than that. From the Deep Sea Challenge website: "The hull, complete with its hatch and viewport, was tested twice in a pressure chamber at Pennsylvania State University to an equivalent full-ocean-depth pressure of 16,500 pounds per square inch (1,138 bars). It passed both tests. Twenty-two strain gauges attached to the sphere gave data that indicated the sphere could withstand up to 140 percent of the test pressure without buckling."
- elithrar 14y ago
  > @PaulGAllen: Pressure at bottom is 16,285 Pounds per square inch at that depth. Design pressure was 16,500 ...Yikes/Amazing! Amazing that it is working. The engineering must be interesting. I'd love to see a dissection of the submersible once they bring it back up. It'd be interesting to see if there were any seal or structural failures.
- HeyLaughingBoy 14y ago
  Essentially no safety margin. I wonder what's normally considered reasonable.