What movie had most of its underwater filming done in a partially finished nuclear reactor cooling tank?

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The Abyss ?

I believe you are right, that it was "The Abyss." In fact, they filmed so much of it underwater that the actors and crew actually had to spend time decompressing.

Yep, you got it!

Most of the underwater filming took place in a half-completed nuclear reactor facility in Gaffney, South Carolina, including the largest underwater set in the world at 7 million gallons. - Trivia for "The Abyss" on the Internet Movie Database

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