Watch Contraband: Seized at Sea

After a woman admits to carrying someone else's suitcase, officers find alarming documents hidden inside. Intel indicates a marble shipment from China is loaded with narcotics. Agents spot a fishing boat with signs it may be a smuggling vessel.

An intel tip-off has officers inspecting shipping containers for stolen cars. Following a hurricane, questionable bundles begin washing ashore. Agents on the night shift are tracking a suspicious vessel when it suddenly disappears from their radar.

Agents look out for private boats being stolen and used by drug traffickers. Officers get a tip-off that a fruit shipment from Costa Rica may have a load of narcotics within. A social media celebrity catches agents' attention for the wrong reasons.

When recreational anglers come across a large package floating off the Florida coast, Border Patrol agents are called to inspect. Officers receive a tipoff that a shipping container full of Colombian sugar may have something else hidden inside.

Agents in Puerto Rico are in for a surprise when they come upon an unidentified warship. Packages washing up on the Florida coastline lead to agents investigating a failed cartel operation. Agents search for a stolen vessel suspected of smuggling.

An agent investigates a boat that made a suspicious late-night drop. Officers inspect a docking ship to ensure there's no concealed load under its hull. Agents track a sailboat coming from the Bahamas allegedly carrying kilos of narcotics.

Agents conducting a random stop-search inspection of vehicles coming off a car ferry get a hit. Officers come across a shipment of 80,000 t-shirts that may all be counterfeit. Agents descend into a mangrove forest to rescue stranded migrants.

Agents must abort a mission when an incoming tropical storm rolls in. A cruise ship passenger balks at paying U.S. duty on cigarettes. Illicit packages dumped at sea begin washing up on Florida's beaches. A Brazilian vessel intrigues agents.

Agents investigate a small boat crewed by three men on a well-known smuggling route, only to confirm the men have a shady past. An agent finds lifejackets and clothing abandoned on the beach, evidence of a recent illegal migrant landing.

Officers race to Port Newark, where a West African car gang is getting ready to ship a stolen luxury vehicle out of the country. Using the owner's GPS tracker on the car, they attempt to identify the container it's in before the ship leaves port.

HSI agents coordinate a massive raid to take down a transnational drug trafficking gang. Agents interdict an erratically moving vessel, often a sign of evasive smugglers -- but it turns out that its passengers have less sinister motives.

A routine inspection of a cargo ship uncovers a well-hidden, illicit load. Weapons smugglers attempt to evade authorities. A luxury boat with a shady history comes on the radar. Agents locate a ship filled with people smugglers trying to make landfall.