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Redundant Air: H Valves, Ponies, Doubles, And The Surface.

Discussion in 'Solo Divers' started by 2airishuman, May 6, 2016.

  1. boulderjohn

    boulderjohn Technical Instructor ScubaBoard Supporter

    # of Dives: 1,000 - 2,499
    Location: Boulder, CO
    25,635
    17,070
    113
    Another instructor and I were setting up for a scuba demo day at a local lake. We set up a diving platform with lines running from it in anticipation of people coming and joining us for activities. It took a while. It was getting near time for things to get started, and we were nearly done. We were both nearly OOA, and I sent him in so he could help get the shore activities started. There was only one minor thing to do on the platform (15 feet deep), and I went down to do it while he headed for shore on the surface. I did the job and headed back toward the surface. I stopped suddenly less than two feet from the surface. My tank valve has somehow become entangled in a line while I was on the platform, and the line was stopping me from reaching the surface. I made a couple unsuccessful attempts to get free, and then look a look at my SPG. It read dead empty. I took my gear off, got to the surface, fixed the entanglement, put the gear back on, and headed in with an empty tank. That is the closest I have ever come to becoming a scuba statistic, and it happened two feet from the surface.
     
  2. 2airishuman

    2airishuman Solo Diver

    # of Dives: 100 - 199
    Location: Greater Minnesota
    2,394
    1,607
    113
    I think that story is insightful and I'm glad you shared it.

    My preferred means of avoiding OOA due to simple exhaustion of the primary air supply is to bring lots of air relative to the requirements of the dive. It is not necessary for there to be redundant components to do this although that is certainly one method.

    One of the benefits of a slung pony is that readily facilitates abandonment of the primary kit at depth in the event of entanglement.
     
  3. 2airishuman

    2airishuman Solo Diver

    # of Dives: 100 - 199
    Location: Greater Minnesota
    2,394
    1,607
    113
    • Streamlining for better movement through the water
    • Keeping an uncluttered kit to facilitate underwater activities such as hunting or photography
    • Keeping the focus on safety through skills to avoid over-reliance gear
    • Maintaining minimal kit size where space and weight are at a premium, as when access to the dive site involves a several mile walk, or where flight logistics complicate bringing a pony bottle
     
    prophet98g likes this.
  4. The Chairman

    The Chairman Chairman of the Board

    # of Dives: I just don't log dives
    Location: Cave Country!
    55,860
    23,221
    113
    Like I said: Misguided agendas... :D :D :D

    If your stage bottle clutters you up or impedes your swimming unduly, you're probably doing it wrong. IOW, you're avoiding safety gear due to a skills issue. Since I've started using an SPG, I've never ever run out or gas. I still always dive with redundant air. Be it a buddy, a stage or a bail out, it's important to have that redundancy.
     
    shoredivr, letonac and Colliam7 like this.
  5. Reku

    Reku Solo Diver

    # of Dives: 5,000 - ∞
    Location: Great Lakes + Northern Florida + Marsh Harbor
    860
    309
    63
    I think that in ANY situation where you are alone you NEED to have a redundant system (doubles, sm, pony etc.). Not only that but you also need a plan - you can die in 8 feet of water quite easily.

    When I dive solo (90% of my dives) I bring 4 lights and 2 of everything else. This includes twice as much back/travel gas and twice as much deco gas needed for the dive. Chances are I won't use the extra gas - so it goes back in the jeep completely full for the next dive but it is nice to have regardless.

    Generally I just stash the extra gas near the area I'll be in. It's nice to have a complete set of gases sitting nearby in case of emergency. On top of already diving sidemount and then taking into account the stashed gas - I believe I am sufficiently prepared.

    Some people think I'm crazy - and they are right! However it works for me so I'm going to keep on doing it.

    *I have had to use the stashed gas before - another diver I found was OOA and I didn't have enough air for both of us to surface (and I had 30mins of deco to do..). We shared air until we got to my stash and then I gave the diver a tank and he surfaced and left it at the front desk for me. I found the diver at about 125' and the stash was at about 110'. I'm not sure how he actually went OOA and I've never seen him since.
     
    Jax likes this.
  6. letonac

    letonac Solo Diver

    # of Dives: 200 - 499
    Location: Croatia
    19
    5
    3
     
  7. Subcooled

    Subcooled Assistant Instructor

    # of Dives: 200 - 499
    Location: Finland
    995
    255
    63
    It sucks to run out of air when you are negative (I tried it in a pool) and Murphys law dictates that you run out of air just when you reach the maximum descent speed :eek: You cannot inflate a wing or suit then, so better be wearing a jacket BCD with weight pockets, and not a backplate and wing. At what depth would you prefer to experience this?

    (ok, experienced divers do not run out of air, but what if you had a single malfunctioning tank, or polluted gas, or you were distracted by pretty fish)
     
    Last edited: Jul 27, 2016
  8. fsardone

    fsardone Solo Diver ScubaBoard Supporter

    # of Dives: I just don't log dives
    Location: Rome, Italy
    463
    435
    63
    Fact is if you are diving solo, you have to have redundancy ... if you want to come out alive from water.
    Redundant buoyancy and air source. When I dive solo, I have the dry suit on one of my post and BCD inflator on the other and I dive with separate bottles or closed manifold, switching regs every 10-20 bars.

    In addition to that I can ditch abot 20% of my ballast ...
     
  9. DevonDiver

    DevonDiver N/A

    # of Dives: 5,000 - ∞
    Location: Subic Bay, Philippines
    15,396
    8,159
    113
    Why? There's prudent guidance given in solo diver training. Why the need to second-guess that advice? Unless looking for supportive justifications to over-rule that advice because it doesn't fit with what you want to do??
     
  10. DevonDiver

    DevonDiver N/A

    # of Dives: 5,000 - ∞
    Location: Subic Bay, Philippines
    15,396
    8,159
    113
    How deep was Quero when she perished?

    Shallow... negative.... solo.... fatal.
     

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