Tijuana, MX (CNN) — The Mexican Military offered a rare look inside a sophisticated drug tunnel.
The entrance is in a building in a busy business park in Tijuana, just four blocks from the border.
An elevator inside a closet goes down to the tunnel, which is nearly four football fields long.
It was found after people reported suspicious activity back in February.
The tunnel includes an elevator, electricity and lights, ventilation and a rail system.
it could have generated millions for the cartel building it, but it was shut down before it was completed.