According to the Coast Guard, the SPSSs are constructed and designed to hold large quantities of contraband while evading detection by law enforcement authorities.
The two boats pursue the narco sub at pace hundreds of kilometres off the Colombian and Ecuadorian coast, with one guardsman yelling 'Stop your boat now!' in Spanish.
Although the waves are intense, two USCG members manage to board the submersible.
Then, the hatch opens, with the raised hands of a suspected trafficker emerging from within, before the video ends.