Sims 2 has the Adventurer career which has a few sea-based levels. https://sims.fandom.com/wiki/Adventurer I think it's the closest thing we have. I've been using Neia's military career mod since before the Military career was announced for Strangerville. While the mod don't have the reward objects or uniforms, it does allow me to choose between army, navy and air force, so I've kept it even though I now have Strangerville.
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dancy
That's not even bringing up the massive sea monster in the Get Together world