The Spy Who Loved Me (1977)
Karl Stromberg (Curt Jurgens) loves the ocean so much that he lives in his own oceanic paradise, Atlantis - a massive base capable of sustaining life indefinitely and submerging itself to avoid detection. But that's not enough.
Taking his cues from Captain Nemo, he despises humanity so much that he wants to annihilate the earth and create a new water-based civilisation based in his image. To see his plans through he acquires some nuclear missiles.
He points one at the Soviets and one at the Americans, cleverly framing each other so nuclear warfare will ensue, wiping everybody out. However this would also irreparably contaminate the earth's water supply Thankfully Bond sees the flaws in this plan, ambushes his dinner and shoots him in the groin twice.