To what distance below the hull must the legs of the COASTAL DRILLER be lowered in order to meet the stability and leg strength requirements during the wind speeds greater than 70 knots?

Correct Answer: Option D — 60.5 feet

Mobile offshore drilling unit operational manuals specify lowering hull legs to 60.5 feet below the hull to withstand severe environmental forces and satisfy structural stability requirements during survival conditions exceeding 70 knots.