569. While the DEEP DRILLER is loaded as shown in Sample Form #4 (Drilling), casing is accidentally dropped over the port side. Because the sounding level and port aft inclination are slowly increasing, you decide that tank 10P has minor damage. Among the possible corrective actions is __________.

Casing dropped on the port side and tank 10P is slowly flooding, increasing list and trim. The correct action is to deballast tank 9P to remove weight from the low port side, counteracting the heeling moment and improving reserve buoyancy without adding water to damaged spaces or increasing displacement.