In theory it’s an underwater camera, but probably in 2020 mine shouldn’t go deep-sea diving. Unless I get it serviced and all the O rings replaced I’ll just settle for it being a gorgeous little waterproof lump of art and ergonomics, and leave it at that.

The Nikonos I, II and III were all based on the Calypso – a camera designed in the 1950s by Belgian Jean de Wouters with input from Jacques Cousteau.
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https://www.35mmc.com/24/04/2020/the-nikonos-iii-a-quick-review-and-some-photos-from-the-kayak-by-david-hume/