Distress signal (Relay tower 0DB-521)

Distress signal is a radio station in the Commonwealth in Fallout 4. It can be picked up after extending the satellites at relay tower 0DB-521. It is a distress message from an unnamed raider to his comrades, followed by a warning to bring radiation-proofing materials such as RadAway and Rad-X, as well as strict instructions never to go into the Glowing Sea again.

Location
The origin of the broadcast is a ham radio in the southern of the two caves.