Members of the US Coast Guard board alleged drug-smuggling vessel

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(ABC) -

Dramatic video shows a U.S. Coast Guard cutter, the Munro, pursuing a speeding semi-submersible suspected drug-smuggling vessel in the middle of international waters in the eastern Pacific Ocean.

In footage taken on June 18, a Coast Guard crew member repeatedly shouts "Stop the boat!" in Spanish at the submersible.

The crew member -- a member part of a Coast Guard law enforcement detachment -- calls out, “It’s going to be hard to get on.”

PHOTO: An image made from video released by the U.S. Coast Guard shows a service member of the U.S. Coast Guard cutter Munro boarding a suspected drug smuggling vessel in international waters on the Pacific Ocean on June 18, 2019.One of two Coast Guard boats seen in the video then closes in on the submersible, as two crew members jump on top of it. One of the crew members makes his way to the hatch, pounding on it until an unidentified individual opens it.

The video ends there.

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Marine patrol aircraft first spotted the submersible and communicated its location to the Munro, Coast Guard spokesperson Lt. Cmdr. Stephen Brickey told ABC News.

The cutter then launched a helicopter beyond the line of sight of the submersible, and directed the two smaller boats to its location.

"It's really difficult to detect, and so, the aircraft that are out there searching for it do a wonderful job]," Capt. Jim Estramante, commanding officer of the U.S. Coast Guard cutter Munro, told ABC News. "The one in our case did a wonderful job locating it. And I tell ya, we were just within a few miles from the vessel from the Munro while our small boats were on scene with it."

The 45-foot-long submersible was traveling around 10 miles per hour "hundreds of miles off the Ecuadorian/Colombian border," Brickey said.

The team that boarded the submersible specializes in high-risk boarding and was armed with night vision to see into the submersible's dark hatch.

Five individuals were on board the vessel, and the Coast Guard seized around 17,000 pounds of cocaine worth an estimated $232 million, the spokesperson said.

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"This is as satisfying as it gets. It's the largest [bust] in the Coast Guard since 2015," Estramonte said. "The crew is ecstatic, everyone plays a part in it, not just the folks on deck doing the boarding. We ran at our highest speed to get there all day. It was an all-hands-on-deck evolution, and the crew worked their tails off to get there."

The use of semi-submersible vessels for drug smuggling is rare, as they are costly to build, according to the Coast Guard.

"It happens probably every year or two [we find a submersible," Estramonte said. "We happened to have [multiple] cases in a couple weeks when we were out there on patrol. But it's a pretty rare occurrence, and they do hold a large quantity of cocaine on board as well."

From May through July, the Coast Guard said that three of its cutters have seized more than 39,000 pounds of cocaine and 933 pounds of marijuana through 14 separate drug busts off the coasts of Mexico, Central and South America.

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