Saltwater is the enemy of moving parts. We've been sailing ships for millennia and we haven't figured out a way to reliably solve that problem. Saltwater boats are constantly fighting a battle against corrosion and take huge amounts of maintenance and they are basically just painted hulls with a few little moving bits sticking out.
This isn't a problem with a magic answer or a problem that will benefit substantially from incremental improvements to materials and designs.
This isn't a problem with a magic answer or a problem that will benefit substantially from incremental improvements to materials and designs.