The station's message utilizes Morse code, played on a loop via the radio. The Morse code pattern from this tower equates to: CQ CQ CQ DE EF K. The translations are as followed.
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.