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Delta P Demonstration
Here's something interesting for those who've never seen what pressure differential can do. On Discovery Channel, MythBusters did an experiment to test the 'myth' that a loss of pressure at 300 fsw in a MK-V would squeeze a diver's body into the hat. Anyone who ever attended dive school knows that it isn't a myth, but to see it is something altogether different. It's such a graphic scene. They use a mannequin packed with pig guts to simulate a diver. It's litererally the most freakish sight... and the noises the body makes. GROSS!! It'll definitely make you your blood run cold.
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Replies to This Discussion
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Permalink Reply by Phil Voltaire on
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To see the short version of the video, go to YouTube and search "Mythbusters: Diving Squeeze"
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Permalink Reply by Mike Wolfe on
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Every diver, tender, and sat-tech should be forced to view this as a reminder to check that damn non-return! Especially you lazy-ass sat divers! When was the last time any of you guys checked the stand-by hat in the bell?
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Permalink Reply by Bill Gardner on
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What a total f@#kin waste of a KM helmet!
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Gauge bailouts/check o rings and reverse check valves before each shift as part of pre- dive.
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Yep, I agree 100% but it sure is the best Public Service Announcement for everyone in the diving industry. If seeing it can save someone's family from tragedy and grief then it was well worth it, even if it wasn't originally intended for that purpose.
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Hiya Shaun, just recovering from the Xmass bloatage. That poor little helmet didn't deserve such treatment. They are some of my favorite creatures devised by man and their Japanese cousins. Did you and Santa finish off christmas with a quart of rum, or did he chicken out again this year? Cheers-b
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Hey Flynn, my apologies for calling it a MK-V... and to think that I dove a DESCO a couple times. If I had to guess, I would've called it a Yokahama from the look and placement of the lights. I never figured it for a KM. I spent my very few hours in the water in 17s and 37s.
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I've heard from some oldtimers that all it would take was a good icing from diving in arctic waters or a ballbearing down the umbilical to jam the check valve and reduce a fully-dressed diver to a hat with a pair of hammers dangling out of the bottom. This is must-see video for anyone attending dive school, right along with that other Delta P video showing some large sea crab getting sucked into the narrow curf of a freshly cut pipe. Has anything like that happened to a someone diving tupperware hats?
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Permalink Reply by James Leach on
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A few years ago some poor soul got sucked into a 4" pipe. As the story goes their wasn't much left of him. I don't know all the details, but someone sure does. Always make sure your hat works properly, don't trust the tenders to test your check valve every time. Don't test for suction on a pipe with your hand, take your glove off and use that, or you can use the bubbles from your pneumo if you have vis.
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Permalink Reply by Dive Diva on
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On 21 June, 1914, a hard hat diver named Edward Cossaboom was working on the salvage crew, recovering bodies from the Empress of Ireland, in the St. Lawrence River. He fell off the ship's superstructure in about 80 feet of water. His tender failed to arrest his fall and he came to rest at 140 feet. The rapid increase in water pressure resulted in sufficient pressure differential that he was sucked into his helmet. The divers who recovered his body said it resembled "a jellyfish with a copper mantle and dangling canvas tentacles.
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Permalink Reply by D Layda on
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Marc Bagneaud, RIP, great diver, a hammer. He got diffed into a pipe, believe it was in 2000 give or take a few years. They had to retrieve his body by pigging the line, not sure if the hat got sucked in too. I know I lost it when I found out, and did not want to hear too many of the sorted details, especially beyond hearing that it was not over quickly nor painlessly... a death of unimaginable horror and suffering. I wouldn't wish a death like that on anyone, not even the likes of Stalin, Hitler or Saddam.
Treat this job like it can consume the best, strongest and toughest men we have to offer with no warning and little provocation, because it has, it does, and it will. Hold onto that, because the best way to make it out of this occupation alive is a total ban on complacency.
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