Federal agents working with Mexican authorities uncovered two sophisticated tunnels from Mexico to warehouses in Otay Mesa, federal officials said Friday.
Check it out:

The first tunnel was discovered Tuesday evening as the result of a five-month investigation by the San Diego Tunnel Task Force, U.S. Immigration and Customs Enforcement spokeswoman Lauren Mack said. The tunnel is about 600 yards long and ends inside a warehouse at 10145 Via de la Amistad.

The tunnel entrance is a 70-foot shaft equipped with a pulley system to hoist smuggled goods into the warehouse, according to an ICE news release. The underground passage is reinforced with wooden trusses, has electric lighting and a crude rail system.

Investigators arrested a 73-year-old Chula Vista woman on Wednesday. She is suspected of supervising operations at the warehouse.