What port-side valves must be open to transfer ballast from Tank 10P to Tank 1P on the DEEP DRILLER, using the Port #1 ballast pump?

Correct Answer: Option B — 23, 35, 34, 33, 43, and 2

Reversing ballast transfer direction from Tank 10P back to Tank 1P on the DEEP DRILLER requires reversing the suction and discharge valve lineup while utilizing the Port #1 pump, specifically requiring valves 23, 35, 34, 33, 43, and 2.