Shipbreaker's radio frequency

Shipbreaker's radio frequency is a radio signal in the Fallout 4 add-on Far Harbor, used to start the quest Shipbreaker.

Background
The radio signal can be picked up randomly while roaming the Island, or, a settler will tell the Sole Survivor about Shipbreaker, which will produce the same result. After tuning into the frequency, the player character will be prompted with speaking to Old Longfellow about Shipbreaker. The broadcast consists of strange noises, resembling wading, which intensify as the player character draws closer to Shipbreaker.