Look at Microsoft’s experimental ocean pod datacenters. They filled the pod with nitrogen so no oxygen oxidizing leads and traces and at the pressure of where it would be dropped to in depth to make the pressure vessel more stable. The computers lasted a lot longer than normal datacenters can expect, the fact it would just exchange heat with the cold water outside meant cooling costs were a non factor and the only thing left was to pay the electric bills and amortized cost of hardware. This is totally feasible and will likely make the hardware last much longer and solar power will give it free electricity. The real questions of feasibility are when considering the satellite link and cost of launch then landing.