Here’s an update on the SeaOrbiter project, which would create an ocean vessel parallel to a space station. The SeaOrbiter would travel the world’s ocean carrying out long term marine research in a semi-submersible structure with work areas both above and deep below the surface.  Underwater vehicles that can dock with the lower section would in turn go down to depths of 6000 meters : SeaOrbiter: Help Build This Space Station of the Sea – News Watch

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An overview of the project: