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Struth! How about we all take a deep breath?... To the OP. Yes I've dived those tanks open circuit sidemount. We call them 5L steels over here. They are my main goto cylinder size. However, we have very long lengths of dry passage to crawl, walk, climb through before we get to the dive sites...

58/70. Which I believe is in in line with the current research. The two experts in the field that I know of are Dr David Doolette and @Dr Simon Mitchell Dr David Doolette suggests that GFlow should be 83% of your GFhigh. Last I know Simon Mitchell suggested he uses 50/70. But that was at a...

I had the same issue for years. Most shops here have a compressor that auto shuts off at a set pressure so no matter what cylinder you bring in, your getting one fill and one fill only. Usually 200 bar (2900 psi) that cools to 180 (2600psi). I ended up resolving the problem by just buying a...

So your dives are between 30-40m most of the time? If I was in your position I'd be asking for 28% in both cylinders. Then I'd keep and eye out to exchange that AL80 for another steel and dive them sidemount. Consider a 40m dive for 20 minutes on 28%. You have a 3 minute stop at 9m then an 18...

There is more to conservatism than the setting on a dive computer. Some things to include... Get a heated undergarment and turn it on for your ascent Perform light exercise during your safety stop. Do some decent cardio 12 hours before your dive. Set your computer to display GF99. If your still...

Ah. I assumed that you were using the same gas in both tanks. Since you should be allowing for a lost deco gas in your gas planning, you should be leaving bottom with enough gas in your 15 to get your to the surface. For this reason I'd be inclined to just put the right mix for your bottom...

Yes but why? Are you saying that its not reasonable to find 40% mixes? Or you don't like diving PO2 of 1.4? Or something else?

Thanks. I think its ok as it wasn't an attack on anyone in particular. I'll leave it in as it may have encouraged some discussion from people that may not have wanted to speak up otherwise. I would go further and say that a problem needs to be discussed before day one. I believe that you are...

Any reason not to replace the filters and keep using it as a perfectly good compressor?

Wait.....why? Lets do a dive to 25m for an hour. That's a 1.4bar O2, CNS of about 50% and around 100 OTU's. A 10 minute stop with gfHI of 70. Seems reasonable?

Yes but I'm pretty much only in caves/wrecks or training for caves/wrecks these days.

Anybody know if there are other dive forums that Andy regularly posts in? I do miss his somewhat passionate opinions. I can't see any links on his FB page but I'm possibly being blind.

:rofl3::rofl3::rofl3::rofl3::rofl3::rofl3::rofl3:

In a way, all diving is normalization of deviance isn't it? You would be safer if you stayed home. We all have to decide for ourselves how how much risk is acceptible. For example, some divers are happy diving solo and others are not. Some divers will dive off a unattended boat and other will...

I think most of the responses here are forgetting the point of a cave class. Its to teach you how to not die in a very dangerous environment. Gear adjustment (especially in sidemount) is often done under water, Hopefully the instructor will be videoing the changes and can show you later. You...

I frequently dive without leaving someone on the boat. My personal rules are; Only in very calm waters Only dive within swimming distance of the shore. Always set the anchor at the start of the dive Use a guideline tied off to the anchor to guarantee that you navigate back the boat.

I would be keen on being able to look at how my SAC rate differs during a dive. However I have better things to spend my money on at this stage. SPG's are low cost and reliable enough. They'll do for the foreseeable future.

When I did PADI AOW 7 years ago. It was fun, but a total waste of time if you expected to learn something you didn't already know. I suspect that it hasn't changed much. If I was in your position, I'd do SSI Deep and Nitrox next. That'll open up 90% of the diving that you might want to do in...

My wife loves her Apeks RK3 fins in pink

I've done it before. I did two wraps around the handwheel. It worked OK but I wouldn't go out and buy them specifically.