A 100-foot (33-meter), twin-screw diesel submarine seized at a jungle shipyard in Ecuador marks a quantum, if anticipated, leap in drug-smuggling evasion technology, the top U.S. counter-drug official for the region said Sunday.

“It is the first fully functional, completely submersible submarine for transoceanic voyages that we have ever found,” Jay Bergman, Andean regional director for the Drug Enforcement Administration, told The Associated Press.