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Second Thoughts About Rebreather Class

Discussion in 'Rebreather Diving' started by ccrprospect, Dec 18, 2019.

  1. martincohn

    martincohn Solo Diver

    # of Dives: I just don't log dives
    Location: USA
    346
    308
    63
    Disclaimer, haven't dived Bikini or Chuuk: YET. But the people that I've talked to that have done the deeper wrecks on air, then later mix, all say the same thing.

    Damn I didn't realize what I was missing or forgot about when I dived mix vs air.
     
  2. bakodiver391

    bakodiver391 DIR Practitioner

    # of Dives: 2,500 - 4,999
    Location: Marshall Islands
    149
    87
    28
    Quite frankly, we mostly do scientific or film work these days. The owner only takes whole vessel charters, not individual bookings. If you can get 9 like-minded friends together, then the Surveyor is an option. What has been popular in the past is to order your own bottle of helium for open circuit, then use it as you please. There is a several month lead time for ordering helium. Small consolation, we don't charge for oxygen or beer.
     
  3. martincohn

    martincohn Solo Diver

    # of Dives: I just don't log dives
    Location: USA
    346
    308
    63
    Does anyone want to OC and pay for He like this? 6x $$$ for OC vs CCR. And then there's the issue of remembering dives after going half way around the world.

     
  4. rjack321

    rjack321 ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 1,000 - 2,499
    Location: Port Orchard, WA
    9,685
    3,807
    113
    Just one?
    I don't seen any practical way a 24m long boat can ever carry enough helium supply bottles to fill 12 OC divers x 18 dives at ~45m even if you used a light mix like 21/30. Nevermind the $$$ which is going to be crazy.

    Maybe if you had 10 CCR divers and 1 or 2 OC divers you could carry enough helium for that.
     
  5. bakodiver391

    bakodiver391 DIR Practitioner

    # of Dives: 2,500 - 4,999
    Location: Marshall Islands
    149
    87
    28
    It's normally a mix of rb and open circuit divers, we haven't had a full oc trip for years. rjack, you're overthinking this. Deep mix for the morning (deep) dive, air top up for the afternoon shallower dive on Sara or whatever. Our years of experience tells us this works. Is it ideal? No. Is it better than not coming? Yes. I maintain that a comfortable doubles diver is a better solution than a new or non-current rebreather diver. That was the OP's concern, maintaining currency, if I can remember that far back. We have had shaky rb divers come to Bikini who have spent most of the trip trying to dial in buoyancy and trim. It's a waste of an expensive, difficult trip.
     
    rjack321 likes this.
  6. Gareth J

    Gareth J Manta Ray

    # of Dives: 1,000 - 2,499
    Location: UK
    794
    659
    93
    When I did an OC Trimix instructors course, we had to come in twice for extra Helium. A few weeks before, they had run an CCR Instructors Trimix course, with half the gas we original took out.
    We also needed to service the Booster pump mid way through the course. Filling all those twinsets and stages seemed to take up all the time we had when we weren't actually in the water.
    Mind you, I did enjoy the last dive of the course, swimming under the stern of the Murree. Starting stops deeper than my previous dives on the same wreck.

    That was at the point I was switching to CCR. Since then I don't think I have done any OC Trimix, its just too expensive.
     
  7. rjack321

    rjack321 ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 1,000 - 2,499
    Location: Port Orchard, WA
    9,685
    3,807
    113
    Like I said, sure a couple of OC divers you could support. But not a whole boat of them. A 300cf bottle of helium would roughly support maybe 1 OC diver using something like 21/20.

    More salient, what's your current helium price per L?
     
  8. Preach

    Preach DIR Practitioner

    # of Dives: 200 - 499
    Location: Nederland
    101
    42
    28

    Last week i heard an operator from truk/bikini saying that they don't have enough helium for oc divers. And helium costed around 20 cents a liter (so 1 set of doubles with 21/35 will cost around 360 bucks on helium alone).
    No thanks, i pass :p
     
    Dark Wolf and rjack321 like this.
  9. abnfrog

    abnfrog Tech Instructor

    # of Dives: 2,500 - 4,999
    Location: great white north
    1,691
    1,281
    113
    I did bikini in 2006 I believe it was the second last trip on the island dive center , yes it was all deep air , I didn't like that but I did it any way , they didn't have deco bottles so we decoed on a bar , I didn't like that either , but the wrecks were great , so there was that
     
    Marie13, Dark Wolf and AfterDark like this.
  10. bakodiver391

    bakodiver391 DIR Practitioner

    # of Dives: 2,500 - 4,999
    Location: Marshall Islands
    149
    87
    28
    I was welding up the piping for the new tank farm on Bikini in late 2006, caught one of the last flights out before the local airline went belly up. Did we run into each other? I used to eat dinner with the divers.
     

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