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Wiktionary
bottom feeder

alt. 1 A fish or other aquatic creature that feeds off the bottom of its habitat; a flatfish. 2 (context idiomatic by extension English) A person who operates amidst or thrives on the unwholesome things in a society; one who takes advantage of the misfortune of others. n. 1 A fish or other aquatic creature that feeds off the bottom of its habitat; a flatfish. 2 (context idiomatic by extension English) A person who operates amidst or thrives on the unwholesome things in a society; one who takes advantage of the misfortune of others.

WordNet
bottom feeder
  1. n. an opportunist who profits from the misfortunes of others

  2. a scavenger that feeds low on the food chain

  3. a fish that feeds on the bottom of a body of water

Wikipedia
Bottom Feeder

Bottom Feeder (also known as Evil Beast and Mutant Assassin) is a 2007 American horror film written and directed by Randy Daudlin. The film centers on a group of utility workers who have become trapped in the underground maze of tunnels underneath the city where they are skulked and killed by something terrible.