The U.S. Secret Service has dismantled a massive hidden telecom network in New York.

Investigators say the system could have crippled cell towers and jammed 911 calls.

The cache included over 300 SIM servers with more than 100,000 SIM cards.

It was located within 35 miles of the United Nations.

The network could have blacked out cellular service, especially during the United Nations General Assembly.

Officials have not uncovered a direct plot against the assembly.

Forensic analysis is ongoing, and authorities suspect nation-state actors.

The operation highlights new risks to the invisible infrastructure of modern cities.