Two small windows in the cockpit of a previously captured semisubmersible drug sub (pictured) would have allowed crew members to watch for obstacles and law-enforcement officials. The submarine is currently dry-docked at Colombia's Tumaco Coast Guard station.
By contrast, the newly captured, fully submersible cocaine sub can dive completely underwater, leaving no hint of its passage from the surface.
The documentary follows Piastro as well as two DEA field agents, "Tony" and "Rich"—whose true identities are withheld—in one of the most dangerous regions of Colombia as they attempt to find and impound subs.
"A typical [cocaine] sub yard that we find on the west coast is in the mangroves with lean-tos [and] a tarp covering it," Tony says in the documentary. "It's not going to show up on any great satellite pictures. They're designed to be stealth."
The DEA thinks drug smugglers are using the subs to transport millions of dollars' worth of cocaine long distances virtually undetected.
The subs probably "transport the drugs to the water off the Mexican shoreline on the Pacific coast, or to Central America, where they offload in the middle of the night," Hoggard, the director, said.
"Some [cocaine subs] are more than likely making their way to Africa as well on the other side of South America."
(Watch cocaine-submarine videos.)