Beneath (2014)

 There are several films with this title, this one is directed by Ben Ketai. It concerns a young female student back home for a while to celebrate her father retiring from his job as a miner. Celebrations are going on in a bar with his workmates and in the banter it is suggested she is against workers being exploited. So, one thing leads to another and she is challenged to spend a few hours in the mine on her fathers last working day and she is only too happy to pick up the challenge.

So the next morning, hangover burning a hole in her head, she is taken down into the mine. She is given a shovel and has to shovel coal into a bin. While she is getting used to the work, at the mine head the drilling stops as the driller finds a hard bit of rock. He's encouraged to continue and breaks through into another tunnel but this causes a collapse and they become trapped down in the mine. Calling up to the surface determines it will take 72 hours to get down to rescue them. They have a metal cabin which provides fresh oxygen via tanks and can keep them alive when the air becomes toxic in the mine.

It turns out that there was a disaster in the past, where nineteen miner's lives were lost because they could not be rescued. So, things start to go supernatural now and something starts turning the men against each other. The young female student starts seeing weird things and the men are disappearing and getting killed in increasingly gruesome ways.

This film is a watchable B movie, if you are bored and have some time to spare.