20000 Leagues Under the Sea

20000 Leagues Under the Sea was the first full-length, live-action motion picture released by Walt Disney Productions. Based on the classic science fiction novel by Jules Verne and directed by Richard Fleischer, the 1954 picture starred Kirk Douglas, James Mason, Paul Lukas, and Peter Lorre.
The following weapons were used in the film 20000 Leagues Under the Sea:

9-inch Dahlgren Gun

The U.S.S. Abraham Lincoln carried nine-inch Dahlgren guns.

Crewmen prepare a 9-inch Dahlgren gun to fire on as sea monster

Nemo’s Underwater Electric Pellet Gun

Throughout the film, Nautilus crewmen carry underwater electric pellet guns, described by Jules Verne as follows: ““Because the balls sent by this gun are not ordinary balls, but little cases of glass (invented by Leniebroek, an Austrian chemist), of which I have a large supply. These glass cases are covered with a case of steel, and weighted with a pellet of lead; they are real Leyden bottles, into which the electricity is forced to a very high tension. With the slightest shock they are discharged, and the animal, however strong it may be, falls dead. I must tell you that these cases are size number four, and that the charge for an ordinary gun would be ten.”