How is a vessel engaged in mine clearing signaled at night?

A vessel engaged in mine clearing at night is signaled using three green lights forming a triangle. This signaling method is part of the recognized maritime signaling conventions and helps differentiate mine-clearing vessels from other types of vessels operating at night. The use of green lights communicates to other vessels in the vicinity that the vessel is engaged in specialized operations, ensuring that they take appropriate precautions and maintain a safe distance.

The specific configuration of three lights arranged in a triangle is easy to recognize from a distance and serves to enhance visibility and safety on the water during nighttime operations. This signaling is essential for the effective communication of a vessel's status and activity, thus playing a critical role in maritime safety.