https://factburger.com/filmburger/movie/diver-dan-1961
Diver Dan – Diver Dan was a series of 104 seven-minute live-action shorts made for children's television. Made by Brian Cartoons, it was syndicated and distributed by ITC Entertainment. The shows were sometimes re-edited into half-hour blocks by local stations. The series featured the adventures of a diver in an old-fashioned diving suit who talked to the passing fish. The series was filmed in live action with puppet fish; the underwater effect was achieved by shooting through an aquarium.