Spiderhole

An implausible yet intriguing set up is fatally undermined by a terrible script and plot holes you could drive a stolen VW van through.

Because the actors have no decent lines they all resort to shouting and gurning, which the director allows them to do. Presumably because he was trying to deflect attention away from the absurd plot developments which spoil what could have been a decent British attempt at the torture porn genre.

If that's what floats your boat then you might still get something out of it. Personally, I prefer my horror to be frightening as opposed to merely repellent.