In the event of a grounding, which tanks should be sounded to determine any evidence of holing?

Correct Answer: Option D — Slack tanks and empty tanks should be sounded. Full tanks need not be sounded.

Following a grounding, slack and empty tanks must be sounded to detect potential hull breaches. Full tanks are less critical because their internal pressure is already equal to or greater than the external hydrostatic pressure, making it unlikely that water would enter the tank even if the shell plating is holed.