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Depth measurement in a cave

Discussion in 'Cave Diving' started by seaseadee, Jul 10, 2018.

  1. seaseadee

    seaseadee DIR Practitioner

    # of Dives: 50 - 99
    Location: Boca Raton, Florida, United States
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    So my next question is this: If you are merrily diving along a sump and come out at an air space can you get bent because you ascended too quickly?
     
  2. DA Aquamaster

    DA Aquamaster Directional Toast ScubaBoard Supporter

    # of Dives: 2,500 - 4,999
    Location: NC
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    Let's say you are diving in a cave and it descends to 300' before again rising to the surface at more or less the same 1 ATA. You'd have to do the same deco stops you'd normally do for the same dive profile in open water.

    That's distinctly different than surfacing in an air bell where the pressure in the bell is equal to the water pressure at that depth.
     
    seaseadee likes this.
  3. The Chairman

    The Chairman Chairman of the Board

    # of Dives: I just don't log dives
    Location: Cave Country!
    52,031
    17,892
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    Yeah, I don't think they hit 90ft of depth. One of the tunnels might have been 90ft long... but not deep. I don't think they were much deeper than 20 ft, but I'm not sure why I think this to be true.
     
    EireDiver606 likes this.
  4. Jack Hammer

    Jack Hammer Solo Diver

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    Conflicting reports. I read versions that clearly stated one or the other, and other reports that were vague.
     
  5. The Chairman

    The Chairman Chairman of the Board

    # of Dives: I just don't log dives
    Location: Cave Country!
    52,031
    17,892
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    and the boys swam out on oxygen bottles. :D
     
    Norwegian Cave Diver and Johnoly like this.
  6. KevinNM

    KevinNM DIR Practitioner

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    I’ve read accounts of people exploring caves that have a super deep, shallow, super deep profiles. It sounds like it sucks quite a bit.
     
  7. kensuf

    kensuf Cave Instructor

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    Yes. Look at the Pozo Azul explorations for examples, they had to do deco at the far end of several of the sumps. Quite an amazing bit of exploration has gone on there.

    Pozo Azul - Cave Diving Beyond the Limits
     
    Norwegian Cave Diver likes this.
  8. EireDiver606

    EireDiver606 DIR Practitioner

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    Yes I heard that they were using oxygen tanks, there’s another thread that highlights how confusing it is that reporters think all tanks divers use are oxygen and the fact that they could have actually been using oxygen.

    I think you’re right though.
     
  9. The Chairman

    The Chairman Chairman of the Board

    # of Dives: I just don't log dives
    Location: Cave Country!
    52,031
    17,892
    113
    It certainly has its ups and downs. :D :D :D
     
  10. rjack321

    rjack321 Captain

    # of Dives: 1,000 - 2,499
    Location: Port Orchard, WA
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    Pretty sure there was no 90ft sump dive in that exit. Media reports are contradictory but at least a couple say they were using FFMs in positive pressure mode fed by cylinders of 80% - which has a MOD of 30ft.
     

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