BOTH INTERNATIONAL & INLAND Which vessel when anchored at night, would NOT be required to show anchor lights?

Correct Answer: Option A — A vessel engaged in underwater operations

Rule 30(g) exempts a vessel engaged in dredging or underwater operations from showing standard anchor lights when at anchor. Instead, they must exhibit the restricted maneuverability lights (red-white-red) and any applicable side lights indicating obstruction and safe-passage sides under Rule 27(d).