Bottle Choices for Tech

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That’s an interesting last sentence rjack321
Everyone bought scooters and dives from shore now, and its hard to even afford fuel and moorage and maintenance on a bigger charter vessel here. So there are 2 commercial boats left now, the skippers are older, were never serious tech divers, and don't have the knowledge or experience to do our 250ft+ sites.

There are a few private boats, but they're mostly small and not capable of supporting people with giant doubles & bottom stages or even CCRs and 3 BOs. Plus lots of people are into photogrammetry and its not really plausible to do photogrammetry on a 300ft deep, 280ft long ship wreck that is only diveable 6 tides a year. I did a few of them years ago, they were $1000+ dives for 18mins of bottom time back then (2008-2014). Nowadays its hard to even get someone to take a weekday off to dive, nevermind spend that kind of money to do the workup dives.

Pretty much all our 250ft+ sites are all in extreme currents, and can only be done a few times a year. They were mostly dove on OC in the late 1990s and early 2000s. AG moved away to California, and then his successor GUE group leaders continued for a decade but eventually retired and moved to FL. Another group of CCR guys continued diving them from ~2005 to 2018. Their main instructor-leader died of an O2 tox event in about 2016. The rest of that CCR group dissolved thorough deaths (2 /10 are poor odds), the loss of their organizer (their 3rd death), had medical issues, or finally hung up their fins.

The experience and judgement to know the exact time to splash, coordinate with the Coast Guard to shut down a shipping lane for diving operations at 9:38am on some very specific weekday in July, a skipper who works with the divers as part of the team, all that is fading from this area fast. There's always tons of talk here on SB about gear choices, and sometimes classes, but the talk about charters is mostly whining about how exorbitant they are. There's a persistent assumption that a charter will a) exist and b) actually know how to put divers on the harder sites. That's not a good assumption.

The dives /wrecks are still out there, another generation of divers could set them as a goal. They would need to work up to them and find a regular motivated skipper & boat willing to learn how to do it with them. I don't see that happening anytime soon however.
 
the big bottles that @helodriver87
One thing you haven't really confirmed @Micheal is what your intended dive profiles really look like. How deep for how long?

I am preparing to due several dives into the Oriskany in 2022, want to get pictures of my Grandfathers quarters whom was a CAG on the ship in the 60's. Will be taking the TDI Extended range and Wreck Pen courses later this spring. I have heard the ship has shifted a lot from the recent hurricanes, so I plan to get 1 or 2 dives this summer to the Flight Deck, so I have an idea how to plan after. See if my HP100 doubles will be enough or if I need to go larger.
 
I am preparing to due several dives into the Oriskany in 2022, want to get pictures of my Grandfathers quarters whom was a CAG on the ship in the 60's. Will be taking the TDI Extended range and Wreck Pen courses later this spring. I have heard the ship has shifted a lot from the recent hurricanes, so I plan to get 1 or 2 dives this summer to the Flight Deck, so I have an idea how to plan after. See if my HP100 doubles will be enough or if I need to go larger.

You'll want bigger backgas bottles and for that dive you'll likely have an AL40 of EAN50 and an AL40 *maybe AL80 depending on run time* of O2. Ratio on that dive is roughly 1:1 using 21/35 for bottom time to deco time for SWAG math. Not sure how far in your grandfathers quarters are for penetration, but that's a big boat, so it may take a hot minute to get in there.
 
I am preparing to due several dives into the Oriskany in 2022, want to get pictures of my Grandfathers quarters whom was a CAG on the ship in the 60's. Will be taking the TDI Extended range and Wreck Pen courses later this spring. I have heard the ship has shifted a lot from the recent hurricanes, so I plan to get 1 or 2 dives this summer to the Flight Deck, so I have an idea how to plan after. See if my HP100 doubles will be enough or if I need to go larger.

I was told that the bulk of the Oriskany was never cleared for penetration. And that she is very dangerous to penetrate.
 
You'll want bigger backgas bottles and for that dive you'll likely have an AL40 of EAN50 and an AL40 *maybe AL80 depending on run time* of O2. Ratio on that dive is roughly 1:1 using 21/35 for bottom time to deco time for SWAG math. Not sure how far in your grandfathers quarters are for penetration, but that's a big boat, so it may take a hot minute to get in there.
Flip that around.

Al80 of 50%, al40 of oxygen.

Biggest backgas you can manage on the boat. Maybe even a scooter to help you cover ground quickly as you approach the access point of your choice.
 
Flip that around.

Al80 of 50%, al40 of oxygen.

Biggest backgas you can manage on the boat. Maybe even a scooter to help you cover ground quickly as you approach the access point of your choice.

type-o, meant to say al80 of EAN50. To @Micheal you need the bigger 50% bottle to cover a failed O2 bottle since your bottom mix is so lean you will have a nasty deco penalty
 
type-o, meant to say al80 of EAN50. To @Micheal you need the bigger 50% bottle to cover a failed O2 bottle since your bottom mix is so lean you will have a nasty deco penalty

Understood. My buddy has some LP108s, we could get some cave fills on. :)

With Steel bottles, there seems to be a noticeable different with buoyancy/Trim characteristics. For AL80's do you generally like Metal Impact of Luxfer?
 
Understood. My buddy has some LP108s, we could get some cave fills on. :)

With Steel bottles, there seems to be a noticeable different with buoyancy/Trim characteristics. For AL80's do you generally like Metal Impact of Luxfer?

about the same, though Luxfer if I can choose
 
https://www.shearwater.com/products/peregrine/
http://cavediveflorida.com/Rum_House.htm

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