Name of adventure movie from the 50s/60s (island; lasers)

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Please help me with this one! I’ve been searching for quite some time. It’s one of my favorite movies from my childhood, but unfortunately can’t figure out the name of the movie! I only remember the one scene where a group of people are trying to pass some kind of defense system on an island, consisting of several towers on a mountain ridge shooting lasers or something. They trick the system by wearing metal chains around their body. Thought the scene was from one of the Captain Nemo movies, but I’ve looked through several of them without success.

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“Thought the scene was from one of the Captain Nemo movies, but I’ve looked through several of them without success.”

Have you looked at this?
https://www.youtube.com/watch?v=7-gNAeXhRUs&t=170s
https://www.imdb.com/title/tt0068748/

Yes, this is it! Thank you so much 😃

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The Mysterious Island (1973).
https://www.imdb.com/title/tt0068748/

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