I think it is not a bad idea, although it would have many challenges, one would be to get a ship to generate the necessary energy for the miners, and then the fuel and food to continue operating, the stability of the internet connections at sea, and the maintenance of the equipment, the salt in the sea wind is brutal with the equipment. but hey if they manage to operate in the brutal climate of siberia they can surely do it from an old soviet transport ship of which there are many in the russian shipyards.