“Meg 2: The Trench” (** out of four) was a scattershot sequel to the surprise 2018 hit about a deep-sea diving team (led by Jason Statham) who encounter problems with a nearby malevolent mining corporation that awakens the title monster and soon there is blood in them thar waters again. In fairness, this is all overall better and more entertaining than the original but seems made up of spare parts from “Jaws 3”, “Deep Blue Sea”, and Statham action movies and stirred in a blender. Final third at least delivers some campy B-movie thrills and scares.