What adventure movie from the ‘80s required over 900,000 gallons of water to film?

I'll grant you this: The '80s broke ground as the decade when computer-generated imagery was finally good enough for significant incorporation into movies. But it was far from ubiquitous.

Tron was the first to really go all-in with CGI, and it was actually met with quite a bit of resistance. Despite its monumental influence on film effects from that point on, the 1982 release was essentially blocked from receiving an Oscar by the old-school practical effects folks. Why? Because they were worried computers were going to take their jobs. Take that for what you will.

While it was making strides, CGI was still extremely cutting edge, especially in the first half of the decade — meaning most movies still had to rely on building insanely expensive, gigantic, completely impractical sets in the 1980s. Including one that required nearly a million gallons of water for filming.

Which movie used this completely insane amount of water on set?