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If you have good Google-Fu I claim you will find a (very, very few) small number of people advertising diving trips to Antarctica. We went, but stayed above water. It was cold enough staying dry. During the summer.As geffink said, Antarctica is by treaty unclaimed by any country. There are a few seamounts in the pacific down near Howland and Baker that would be diveable, I'm not sure how you'd get there.
Walters Shoal in the southwest Indian Ocean at 33°12′S 43°50′E is in international waters it rises up from 700+m to 18m, closest land is Madagascar 430nm north. Was out there on a trawler many years ago and just so wanted to jump in for a dive.
National Geographic has pictures of Antarctic fish.If you have good Google-Fu I claim you will find a (very, very few) small number of people advertising diving trips to Antarctica. We went, but stayed above water. It was cold enough staying dry. During the summer.
We were repeatedly told by a fish expert that there were NO fish in Antarctica (Wildlife of Antarctica - Wikipedia). Lots of krill, whales, lion seals, ice and penguins & Skua.
Our fish expert did identify that the very tasty "chilean seabass" we find at all the local restaurants is really called Patagonian Toothfish. Patagonian toothfish - Wikipedia