>>193014Those are underground electric equipment access emplacements. They can check voltage and shit like that from the boxes, and the concrete thing is like a jar lid, only its over a tunnel. The metal trap is, well a metal trap door.
>>193017Explains why you shouldn't fuck around.
>>193019Sends a signal in the event of a problem.
>>193020Hell this all looks close enough I can see a water tower. Its electrical and they are all over. Sorry to say it but its not like you've stumbled on anything incredibly rare.
