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OK, the thread became too long and people start asking tldr questions. Time to wrap it up: I should take the Rescue Course to learn what I really need. On top of that, I take private / VIP lessons on top to learn what I want to master. Finally, we all hope that the day of a true emergency...

Well, physical exhaustion can be the outcome of athleticism. That should be fun, and mostly is. We all know the good feeling after a team sport event, a long hike / run or cycle tour. And I enjoy that, too. However, after watching the Rescue Diver videos on Youtube and reading the Rescue Diver...

Thanks! I hope so, too. Dive accidents can cause psychic traumas to the rescuer or witness, so it is best to never experience one. I have heard a few voices saying that the Rescue Diver could be fun. I have no clue what the funny parts might be, but it could change my mind. @Edward3c: I had a...

Let me put it this way: When you go to a restaurant and there is a yummy dish you would like to eat, but you are allergic to one of the ingredients - what do you do? You ask the waiter whether you can have the dish without. Or you prefer another side dish, what do you do? It is not a crime to...

Thank you very much for all the detailed answers! Now it is clear to me that the dive rescue exercise is standard and not negotiable. To answer your questions: I think that the PADI Rescue Diver contains much more than I really need, and I would like to focus on what is related to my diving...

Question to all PADI professionals: What are the minimum required skill demonstrations of a PADI Rescue Diver course? I have two copies of the PADI Rescue Diver Manual, German edition: The older one from 1993 lists all exercises / skill demonstrations in detail. The most recent one, revision...

Apparently, the funny side of the Spanish law is that you do not need a certification. To exceed the recreational depth limit, you only need redundant gear (as listed in annex 3) and a suitable breathing gas. So, two recreational divers who dress as technical divers can go deeper than 40m. I...

Last year, the Spanish government issued order no 550 (Real Decreto 550/2020) that addresses the legal limits of SCUBA diving. The full text was published in the Federal Gazette BOLETÍN OFICIAL DEL ESTADO issue no. 177. The first paragraph of article 18, forbids solo diving and sets a depth...

Thanks to you of all for your advice and the variety of hints! Sounds like I should better wait for the re-opening of the dive shops and try a few models and sizes. I have found the black Scubapros without springs only in two shops, with the exception of XXL fins, which always come without springs.

For many years, I dive the Mares Avanti Quattro in both wet and dry-suit. When I took my recreational Wreck Diver class, my instructor highly recommended to get new fins with a shorter blade, which are more suitable for wreck diving. Now I consider to go further on the wreck diving path...

To my knowledge, pure oxygen is possible. The datasheet allows up to 99% for the deco gas. The Horizon comes as a non-deco base version with an additional deco kit that basically contains a second first stage for the deco tank. (There is probably a code to unlock the capability of the computer...

1) Did a try-dive in a pool in an old worn 5mm wetsuit, which equals the buoyancy of a 3mm brand-new wetsuit. 6 kg of weight were loaded on the unit and I had no weight belt, still needed to add some air to the wing. So, I would guess that the Horizon is neutrally buoyant in water with 3 kg lead...

Does anyone use the lower set of mounting loops of the xDeep Stealth 2.0 Classic compensator? The manual says, those were advised for recreational open water diving, because they provided greater comfort compared to the upper set of mounting loops (xDeep manual, p 44). I haven't seen the use...

When I grew up in cold-war times, were were told that freedom was the highest value to US citizens. From this discussion, I would say it is law and order. What happened here? The girl took a swim, no-one hurt, nothing stolen. Four months prison ... serious?

Apparently there is no full coverage of Europe anymore: ANDI Adria = Slovenia, Croatia, Serbia, BIH, Montenegro, Kosovo, Macedonia, Hungary, Turkey ANDI Mediterranean Ltd is located on Cyprus How about The Netherlands, UK, etc.? The headquarter as issued two notices, telling that any...

Any background information regarding this strange announcement? I suppose that text was not phrased by a native speaker.

Fully agree with wnissen. I do not blend breathing gasses, so I cannot provide an alternative here. At work, I can use simulation software from Aspentech or Simsci that has variety of thermodynamic models. For simple problems, i use them out-of-the box and do not really care - still good...

It's always fun to see Mr. van der Waal pop-up in SCUBA forums from time to time. Apart from educational purposes and approximations for compact equations, no-one else is using vdW as equation of state for real gases. But yeah, why not? I would drive a Ford T model just for fun, but not to carry...

Teaching university stuff to SCUBA students is not my point. I am just saying: Don't search SCUBA books for scientific explanations about buoyancy and trim. Go for the scientific literature to find the answers to scientific problems. In my opinion, the better approach to address the problem of...

I doubt that there is much more to buoyancy & trim than adding or removing weights first until you got the optimum amount, then distributing your gear a little head-wards or toe-wards until you can maintain the horizontal trim effortlessly. But nevertheless, let me add two footnotes to this...