While in transit during heavy weather, the crew aboard a semisubmersible should be alert to repeated pounding of waves on the lower bracing. If necessary, the unit should be __________.

Correct Answer: Option C — ballasted to survival draft

Severe wave slamming on lower structural bracings during heavy weather requires adjusting the semisubmersible's ballast to survival draft, which elevates or submerges vulnerable structural members out of the primary wave-action zone to protect structural integrity.