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Darnold9999:Re entanglement, it is one of the things I practiced on my solo course. Instructor tangled up the first stage from behind, I had to get unentangled on my own. The only way was to remove gear, turn, unentangle and then try to put the gear back on. Couldn't do it. Got unentangled no problem, but could not get the gear back on. Steel backplate and tank were too heavy and me in a drysuit was too boyant. Had to surface carrying the tank and backplate in front of me and put it on on the surface. A viable option, but did convince me that I don't want all of my weight attached to the backplate - such a configuration would make this manuver virtually impossible.
Probably the best part of the course. Something that you do NOT want to practice alone.
Was a course necessary - no - and the reason I took it was so I would have a card that I can show an operator and dive on my own when I travel. However it was a good course and it was useful to practice entanglement, working with line and to discuss the what ifs.
For what its worth I firmly believe that you should not be doing this until you have some significant experience diving, are totally comfortable in the water and know how you will react in an emergancy while diving. Don't actually dive solo much, but also firmly believe that I want to be as self sufficient as possible, buddy might help, but I don't want to depend on it.
Any discussion of when you should try to cut away the entanglemet directly vs. doff the BC/BP to deal with the entanglement vs cut away the BP harness to deal with it. My limited experience is that movement while you are entangled tends to aggrevate the situation. When I have gotten entangled while diving with my wife, I usually just hold still while she gets me out. I've never been seriously entangled while solo, I've found that the less you have to move to get free, the better.