Colombian police on the Pacific coast destroyed a submarine outfitted with modern technology and with the capacity to transport up to eight tons of cocaine.

The vessel, 12 meters (39.4 feet) long and 3.5 meters (11.5 feet) wide, could accommodate up to four crewmembers, was constructed of steel and fiberglass and had a powerful diesel motor, police said Tuesday in a communique.

According to the information provided by the authorities, the sub was equipped with an electric generator and a ventilation and oxygenation system, GPS, a gyroscope, sonar and six oxygen tanks.

The sub, which was ready to be dispatched to Central America carrying drugs, was in a rural part of the port in the city of Tumaco in the custody of FARC rebels, police said.

Police also said that participating in the seizure and destruction of the vessel were members of the Colombian military in coordination with the U.S. Drug Enforcement Administration.

The sub had been built in an improvised shipyard in a remote mangrove swamp.

Upon disembarking from their aircraft in the zone, police faced bursts of automatic weapons fire, which led to a brief exchange of gunfire after which the people tasked with guarding the area fled. EFE