I meant heatsink as in the water itself - not the reactor hull. As far as I know, pumps are used to exchange seawater directly with the surrounding environment

I meant heatsink as in the water itself - not the reactor hull. As far as I know, pumps are used to exchange seawater directly with the surrounding environment - hoses are used to this effect in dry dock. I am told there are proprietary secrets used to control the electrolysis output gas mixture and coolant temp mixture so as to not increase detectability.