Northern California Coast Guard Crew Makes $181M Drug Bust

August 6, 2015 Updated: August 6, 2015

SAN FRANCISCO—The U.S. Coast Guard based in Northern California seized 12,000 pounds of cocaine from a vessel in the Eastern Pacific in one of the largest busts of its kind.

Some of the cocaine was lost when the vessel sank during towing.

KNTV reports ( ) Thursday that Chief Warrant Officer Allyson Conroy says that the crew based in Alameda, California, also apprehended four suspected smugglers. The drugs are valued at $181 million.

The bust was made about 200 miles south of Mexico last month. It was not announced until Wednesday. The names of the suspects were not released.

The drugs were found on a semi-submersible vessel, which is mostly submerged, with just the cockpit and the exhaust pipe visible above water.

Conroy says the vessel sank during towing and about 4,000 pounds of cocaine were lost. Conroy says there was no harm to the environment.