Check out this silent version of 20,000 Leagues Under the Sea on Viki:

This was the first motion picture filmed underwater! As Wikipedia states:

Actual underwater cameras were not used, but a system of watertight tubes and mirrors allowed the camera to shoot reflected images of underwater scenes staged in shallow sunlit waters. (,000_Leagues_Under_the_Sea_(1916_film))

Here in Media Services, we of course have the 1954 Disney version (HU DVD 10179):

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