On the COASTAL DRILLER, when afloat, oily bilge discharge should be pumped through the __________.

Correct Answer: Option B — skimmer tanks

The COASTAL DRILLER utilizes skimmer tanks as part of its oily water separation system. Discharging bilge water through these tanks ensures that oil is captured and retained on board, preventing illegal overboard discharge of pollutants in compliance with MARPOL Annex I and 33 CFR Part 151 requirements.