If they are made by Asahi they can be very negative. The interior at the bottom can be rough from the rolling process and more difficult to prevent from rusting. The valve threads may be the taper style. They are likely dry galvanized instead of dipped. If you carry weight they can help...
Still not really getting the need. It's not unusual to have to float around for 20-45 minutes waiting for a pickup. Especially if you have widely differing run times and the dive boat isn't tied in. What if you're on open circuit and another guy is on a rebreather? Now if my wing sprung a...
You're not going to tox on OTUs while recreational diving. Your only concern would be max depth so to be conservative just make it the same limit as your original blend.
I have used a dog leash. It has a loop at one end and a clip at the other. Those are nice if you suddenly need both hands. Generally use if viz is less than 12 inches. No real hazard. Just let go of it.
And yes, I would risk my life for a family member but possibly not for someone else.
Cards don't matter? I've never taken a course where I didn't learn something. AOW required for lots of dives. Deep- good start for deeper diving. Wreck- good start for cavern. Nitrox- required for advanced Nitrox. Cavern- required for cave. Deco procedures- required for deeper/longer and...
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