There's also the Nautilus "Luxury Yacht Submarine" from U-Boat Worx [1].
I don't think either of them have ever been built, they're basically just Kickstarters for ultra-rich people.
Edit: There's a link for Migaloo NFTs on OpenSea in the footer and a fanciful floating habitat that looks like a seasteaders wet dream. This does not look like a serious project. The entire site is nothing but renderings. U-Boat Worx at least ships the NEMO submersible so they kinda know what they're doing.
There seem to be a few fancy boat projects that turn out to just be renderings and NFT scams.
Like https://www.pangeosyacht.com/projects, an $8 Billion „Terayacht“ maybe launching in 2033. Until then they sell NFTs for a place in the virtual Unreal Engine version of this (also still to be built).
I don't think either of them have ever been built, they're basically just Kickstarters for ultra-rich people.
Edit: There's a link for Migaloo NFTs on OpenSea in the footer and a fanciful floating habitat that looks like a seasteaders wet dream. This does not look like a serious project. The entire site is nothing but renderings. U-Boat Worx at least ships the NEMO submersible so they kinda know what they're doing.
[1] https://nautilus-submarine.com/