The Abyss (1989)

Intense underwater peril throughout - characters nearly drown multiple times, fight for survival in flooding compartments. Some physical confrontations between crew members, a character is punched. Military personnel threaten violence. A character sacrifices himself in an emotional scene. No graphic blood or gore, but the life-threatening situations are visceral and sustained.

Very intense underwater sequences with characters trapped in flooding compartments, running out of air. Claustrophobic environments throughout. The alien beings are mysterious and initially frightening (glowing lights in deep darkness). Some jump scares. The overall tone is tense and suspenseful rather than horror-focused.

Occasional strong language including 'shit' and 'goddamn' in tense situations. Not excessive but present in moments of high stress. Some milder profanity throughout.

No sexual content or nudity. Some mild romantic tension between main characters but nothing explicit.

Social drinking in one scene - characters share a drink. No drunkenness or substance abuse depicted.

High emotional intensity throughout - characters face life-or-death decisions, experience claustrophobia and panic, deal with grief and sacrifice. The drowning sequences are particularly intense. Marital tension between main characters adds emotional complexity. The film builds sustained tension that may be overwhelming for sensitive viewers.