The Wall Street Journal went out on patrol with customs agents in northern Spain who scour the coast for drug traffickers.

Hidden beneath the surface, it smuggled more than anyone imagined. The numbers are staggering.

The Coast Guard seized $510 million worth of illegal narcotics aboard drug smuggling vessels, including a narco-sub with over 8,000 pounds of cocaine.

Narco-submarines, the clandestine vessels used by drug traffickers, represent one of the most sophisticated and elusive methods of smuggling drugs across international waters.

Over 100 university, college and scholarly society presidents published a joint statement on Tuesday opposing the Trump administration's treatment of higher education institutions, coming together ...

An curved arrow pointing right. A U.S. aircraft was flying over open water off the coast of El Salvador when they noticed a submarine at the water's surface. The U.S. Coast Guard seized the "narco ...

Submarines: Perhaps the most sophisticated method involves the use of submarines, often referred to as "narco-submarines." These semi-submersible or fully submersible vessels are built ...

Dateline meets the gangs using submarines to smuggle cocaine into Europe. Drug seizures across Spain are on the rise as customs officials struggle to find these near invisible targets.