A generous 5 stars because it's so amateurishly done and acted it becomes funny. Too many holes in the plot render it ridiculous. It's only good because it's fun!
An enjoyable film set in an old mould taken off a stage play and this shows as the script is tight and to the point, never wandering from the subject at hand.
Silly and boring. Long drawn-out cave scenes. Nothing exciting even when the "terror"(!) strikes. They must have used plenty of detergent to make this film about the creeping, in reality cascading, soap-suds.