The station's message utilizes Morse code, played on a loop via the radio. The Morse code pattern from this towers equates to: CQ CQ CQ DE EF K. The translations are as followed.
"Calling all stations, any station"
A general non-emergency call, indicating that the station is looking for a reply from any station that can hear it.
"From" or "this is""
Identifying the sender, followed by the station's ID or callsign repeated two or three times.
This is where the call sign is broadcast. Two letters long, correspond to station name.
Invitation to transmit
The transmitter will pause and wait for a reply from another station.
There is a red "X" under the ground seen using no clipping mode (tcl in the console), similar to the other sealed cistern at WKML Broadcast Station.
When using the console command 'tcl' players can see that it is not in fact a drainage chamber but instead an escape route from the train tunnels. There are two train tunnel segments which run parallel to the sealed cistern.