Well, there are several different ways to put a guy out and we see them in the news or in bdsm videos, often. There is putting a guy out by means of a blood choke such as by scissoring and as seen in dozens and hundreds of vids by "scissorfoxes." There is scissoring and there is putting a guy out in the way that Daniel Penny put out the guy on the NY subway, except that Daniel Penny seems to have done things in a questionable way. But there are dozens of dommes and other knockout women who do this thing. And in addition to scissoring and a rear naked choke, there is smothering till a person is out and there is drowing till a person is out or underwater breath-holding. However, the underwater stuff seems to be made and sold by people who work or are trained as life-guards or first responders, working together with 1 or several female models who are willing to be underwater till they go out and knowing that they should be or will be resuscitated. So there is smothering, underwater holding, scissoring and rear-naked chokeholding. You folks perhaps have simply not seen the vids that much!

On Sunday or a few days ago I saw the movie Last Breath about a deep sea diver who was without oxygen for 29 minutes and brought back to life. The doctors or professionals have no good and sufficient expl as to why he is still alive and without any mental or physical damage, other than that the deep sea and cold temperatures may have interfered with the usual body deterioration! And a few years ago I saw the movie about rescuing the boys in the cave (not the one of the miners who were in some tunnel) or trapped. In order to get them out, the rescuers had to drug the "victims" so they would not struggle or have problems as they were being taken underwater to their rescue!

https://www.youtube.com/watch?v=CbfwRbQaDVU

talking to the drug guy about using drugs to effect the rescue of the boys in the cave.

https://www.youtube.com/shorts/JbL72KYnN3M