The Rift (1990)

The US deep-sea exploration submarine Sairen-1 crashed during a routine mission, and the authorities ordered submarine designers (protagonists) to organize a team made up of soldiers and various kinds of scientists. take another submarine of the same type, Sairen 2, to go to sea Rescue No. 1. Among the members are two women, one of whom is the ex-wife of the submarine designer. The clue of the search is a "black box" on Sairen No. 1. The rescue team sailed to a very hidden trench. On the way, the yellow submarine was wrapped in a huge white unidentified object, and the captain used electric shock to drive the monster away. Three divers went out to explore and found that the seaweed here had mutated, which was surprisingly large. One diver was killed by an alien attack hidden in a seaweed forest, and two other survivors collected some mutated seaweed and returned to the submarine. In order to avoid being attacked by mutant creatures, the submarine explored the interior of the trench. It was found that there was a huge hole at the bottom of the trench. The submarine surfaced, and the crew entered the deep cave wearing special protective clothing like spacesuits. It was found that there were traces of artificial excavation inside, full of mutant creatures, some similar to giant bees, some similar to sea snakes and dinosaurs.