The DEEP DRILLER is loaded as shown in Sample Load Form #4 (Drilling). While the unit is deballasting, starboard valve 17 fails in the closed position. You may deballast from tank 8S by pumping from tank 9S and opening valves 18 and __________.
Official USCG Answer & Rule Citation
Correct Answer: Option C — 20
Routing ballast suction through cross-connection valve 20 allows continued deballasting of tank 8S via 9S when primary valve 17 is inoperable, per DEEP DRILLER emergency ballast system instructions.
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