Anyone ever seen Richard Fleischer's 20,000 LEAGUES UNDER THE SEA???
Just saw it for the first time. There's no doubt this was the inspiration for the story in THE SPY WHO LOVED ME. Stromberg and his fascination with life under the sea is basically Captain Nemo (James Mason) and his story. Even the Nautilus attacking ships is basically like the Liparus creeping up and swallowing submarines. I also can't help but think that the giant squid that's featured in this film must have inspired Fleming to include a squid in his DR. NO novel.
Basically there's a strong Bond vibe in this Disney film, primarily with James Mason's villain Captain Nemo and his futuristic-looking Nautilus submarine (which folks think is a sea monster, just like the "dragon" in DR. NO). Plus some lush underwater and tropical scenery as well as a villain's base/lair (on the island of Vulcania) which gets destroyed at the end.
Connery, Moore, and Brosnan! Accept NO substitutes!