Lowering the hull of the COASTAL DRILLER and refloating should be done in favorable weather conditions with wave heights not more than __________.

Correct Answer: Option A — five feet

Refloating and lowering a self-elevating mobile offshore drilling unit introduces high vulnerability to wave-induced impacts against the hull underside (slamming). Standard marine guidelines restrict this critical maneuver to favorable weather conditions with wave heights not exceeding five feet.