There are other of these caves in the area, it is a bit to get to them, the one he is in has a bit of current as it goes to like 650' to 700'.
the vis is usually like 100'. the divemasters at the place I got tanks and air told me how to get there and dive it, they would guide but said if you have been in a cave it is not bad. I agree it was a great dive, others were there when I came back out, that had tanks in different configurations, A lot older then the one in the vid. With barely understanding one diver said it is the same just deeper.
I would of liked to try deeper, but my agenda was to dive the other caves also, without spending a ton of time getting all the gear the entry.
Until you go to europe and dive them, it is hard to see that there ways and gear are what they have available for there money.
Another thing is they go into military right after school, thats how most countries are, and they all get scuba dive experience. So most learn to dive and had no say if they wanted to or not. Things may have changed since I do not know.
Happy Diving