So in 1960 Jack Kinney Studios got the contract to produce 486 bazillion Popeye cartoons. And apparently Jack Kinney had just gotten into skin diving because he did at least two cartoons in which Popeye and Brutus go skin diving and have weird encounters. Like, here, in Skinned Divers --- https://www.youtube.com/watch?t=337&v=PyvobtmZClI&feature=youtu.be --- where he meets the mermaid version of Olive Oyl. Not Olive Oyl as a mermaid, understand, but a mermaid who just happens to have the appearance and so far as we can tell personality of Olive Oyl. You can find more thoughts about this and about the other skin-diving Popeye cartoon that Jack Kinney wrote at https://wp.me/p37lb5-3ms if you like.