Years ago I did a SCUBA Diving course. I enjoyed diving at the time, which took place in open water, but I don't dive anymore.
Cave diving is a totally different ball game. The divers who brought those boys and their coach out are absolute heroes in my book. To qualify as a scuba diver involves a lot of training. Those divers somehow had to convince the boys, which according to a news article some of them haven't even learnt how to swim yet, that everything will be okay.
Kudos to all involved with the rescue and condolences to the friends and family of the Thai Navy Diver who lost his life (ran out of air) whilst trying to rescue those boys.