Damp 1989
What was going on in 1989 that caused The Abyss, Leviathan, and Deep Star Six to be made in the same year?
(Wikipedia actually adds to the trend, including The Evil Below, Lords of the Deep and The Rift)
Did we have some sort of underwater-alien SFX breakthrough? Were diving suits the new craze?
They are clearly all the same film. Take the titles off and no way can you identify them.
I choose to believe the posters tell a story in three parts – woman trapped in a diving suit; woman escaping a diving suit; the diving suit, abandoned.