Check out this silent version of 20,000 Leagues Under the Sea on Viki: https://www.viki.com/videos/1037941v-20000-leagues-under-the-sea

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. (https://en.wikipedia.org/wiki/20,000_Leagues_Under_the_Sea_(1916_film))

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