I had no idea this would turn into a two-hander, a film genre that I'm not particularly keen on. However this one was original enough and the circumstances were edgy enough to overcome any possible boredom.
We see the background to the two leads' lives, which is essential to understand their motivations and interactions later. After an accident that traps both teacher and pupil in a cave complex, these two young men become close during their efforts to get out.
I'm glad to have seen two things. Firstly that there turned out to have been no hanky-panky in the story between the two leads. Secondly that it's emphasised that the urge for a relationship, however fleeting, comes from the younger guy, something that pertains so often in real life.
I didn't know there was an epilogue after the closing titles. I'm going to have a look now. Pretty dumb way of doing it though, I have to say.