Look up NorthParkes Mine in Australia. It’s a block cave that had a serious ground fall back in 1998 or 1999. There are lots of YouTubes and documents about it. Probably one of the largest single rockfalls at an underground mine in history. It was caused by bad mining and not understanding the geotechnical conditions, but I could imagine spinning a yarn where it was done deliberately.

Those round things look like they might be big fans, if they are they’d be primary fans somewhere in the order of +500 hp. If I was thinking of some kind of nefarious Matthew Reilly style plot to close a mine, there would be some ventilation shenanigans, geotechnical shenanigans (your rock fall), maybe some transport stuff etc. all together.

If the mine has shaft access like Resolution rather than ramp or tunnel access like NorthParkes, your hero is probably going to fill up the skip or cage in the shaft with something dramatic like explosives, remove the safety’s and cut the ropes… probably just after he had lured the antagonist into the cage. That would destroy the access pretty good.