755. Failure of both port ballast pumps on the DEEP DRILLER prevents their use. To deballast from tank 1P, you may use the __________.

Failure of the port ballast pumps necessitates using the starboard ballast pump and crossover system to deballast tank 1P, as this arrangement provides redundancy for ballast transfer when one side's pumps are unavailable; saltwater service, drill water, and bilge pumps are not designed for this purpose and their use would violate established procedures.