Authorities say seized drugs had a street value of $ 1 billion . Officials describe the underground passageway as a `` super tunnel '' Authorities say one people were detained after the tunnel was found . Mexico prosecutor : Officials said the drugs seized as part of this week 's tunnel investigation had an estimated street value of nearly $ 12 million . The tunnel was built by U.S. 's Laura Duffy cartel .
Authorities say seized drugs had a street value of $ 1 billion . Officials describe the underground passageway as a `` super tunnel '' Authorities say one people were detained after the tunnel was found . Mexico prosecutor : The tunnel was built by U.S. 's Laura Duffy cartel .