I read somewhere -forgot where- that the 4th Chinese aircraft carrier will be propelled by a molten salt thorium reactor. This will lead to 1000 (?) times less nuclear waste, and operates at temperatures of around 800 Celsius. It seems that even the Americans do not have such a capability. Is this the answer to producing cheap hydrogen in large quantities, in view of the high temparsature needed to break down the water molecule?
But even then the pressure and cryogenics problems still exist.