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I'm assuming a diving depth of only 60 feet. Hence, Say this to yourself: "It's a short way to the surface" Repeat. (Do you want to perform a controlled emergency ascent or an air sharing ascent with a panicked buddy? Maybe he would be cool but you cannot know in advance)

Or rent a car and drive to Calakmul and Rio Bec Dreams. It was an unforgettable experience. I don't know how safe it is today. 20 years ago there was a military roadblock and me not speaking spanish... Security advice is not included. In Tulum there are many cenotes, e.g. Hilarios well...

Same for Finland. Diving is organized by associations that have their own compressors and mixed gas solutions and boats (or whatever dinghy they might afford). We still need someone to repair and test our drysuits, service regs, do hydrostatic testing... Same There used to be several dive...

One thing to note is that - sometimes a diving club is run by a dive center (I'd call that CRM) - sometimes a diving club is a non-profit association (you will only fill the capability/skill gaps) These scenarios are wildly different. This may depend on the geographic region and whether there...

Your cylinders are clipped to the waist band. The waist band needs to be low enough that the cylinder valves do not push into your armpits or beyond but are comfortable. Placement depends on person. Of course there are rules of thumb that are good for most people, but ultimately you need a good...

Put the cylinders on. Test in a pool. Ask your friend if the cylinders are about horizontal. Make sure the cylinders feel comfortable. Not too high in the armpits. Not too low. Comfy and balanced. It is just a harness. It is used to carry things. You need to adjust it to fit your body. This is...

Is this study suggesting that if the blood does not carry enough oxygen to support the brain, blood flow to the brain is increased? What a surprise!

Subsurface will show you the tissue loading graph. Slow vs fast tissues behave differently and thus, you might need different mandatory decompression schedules for various times at various depths.

Oh, why did I reply to an 11 year old post? Useless comment removed. Questions are eternal.

Nope. It rotated too easily. I do not. Maybe that changes something? This happened to me too, and my dive buddy, who tried to inhale from an upside down reg wasn't happy. It did not perform all that well --> wet breathe

When you do share air, please make sure that the regulator does not rotate 180 degrees around that swivel. Mine did. The result wasn't pretty. Nobody died or got injured, though. Since then I have removed all extra moving parts from my longhose. The swivel was comfortable, though. I used to...

You need a nearly neutrally buoyant extra cylinder, either steel or aluminum. It will hang on your side and if it is very heavy, it will be unpleasant. One example: I am often diving with a (European) 7/200 steel cylinder. It has 7 litres (70 cubic cm) of internal volume and 200 atmospheres of...

It might be possible to counteract static torque by well placed fin kicks or hand movements. How realistic or easy that would be, needs to be answered by someone who has done a significant amount of dives with backmounted doubles. My guess is that it would be a struggle, sooner or later...

As is said above, it's too far up. It also seems to be very tight. I am not familiar with the Razor harness, but I wonder if you need it that tight, given the balanced nature of sidemount. Make a change and perform a test dive, perhaps in front of an action camera.

I do not dive with doubles, but let me make some wild guesses based on physics. About rotation: Let's take this simplified model: a submerged diver (starting in horizontal trim) steel plate on the back one buoyant bladder on each side of the plate (simplification) one steel weight on top of...

Yeah, I know what you mean. I don't have an Aqua Lung dive knife but I do have one with a smooth sharp edge and it is often less usefull. I find I need a serrated edge instead. What are you cutting? Kelp? Cave line? Barbed wire? Fishing line? A fishing net? Rope? Dyneema (I'd feel sorry for you...

Note: Those who cannot find a remedy for motion sickness (caused by waves) can find great dive sites in inland lakes, quarries, rivers, ... There is life in lakes too and many activities to pursue from underwater photography to fish identification to search & recovery and beyond. The sea is not...

Until you hang a Poseidon Cyklon Metal on it and learn to understand the weakness of your jaw :wink:

My Poseidon mouth piece is maybe 10-15 years old and is meant for Poseidon Cyklon.

Apeks and Poseidon mouth pieces compared. I do not have Aqualung mouth pieces. I would guess that Aqualung and Apeks (now owned by Aqualung) regs have the same opening size of 30mm, but that needs to be fact checked. The middle image is a bit misleading, the orifice is 30mm and external size...