The Hierarchy survey vessel was a type of starship utilized by the Overlookers.

The ship was armed with polaron-based weapons including torpedoes and directed energy weapons powerful enough to disable a Delta Flyer-type shuttlecraft. It was equipped with a warp drive, transporters, tractor beams and a cargo hold large enough to hold an Intrepid-class warp core. The ship was protected by auto-regenerative shielding, that was not strong enough to protect the ship for long against an assault by two Starfleet shuttlecraft armed with phaser emitters.

In 2378, Zet and Nar stole one of these ships and used it to kidnap Captain Kathryn Janeway and The Doctor on their return to the USS Voyager from a medical symposium. Zet then ordered The Doctor to steal Voyager's warp core or he would kill the Captain. The Doctor, after impersonating various crew members, returned to Zet's starship with the core, however, Zet refused to live up to the deal, and imprisoned The Doctor with Janeway in a holding cell located just off the bridge. Zet later abandoned the core when Voyager's crew discovered the plan and engaged in a rescue effort which was ultimately successful. (VOY: "Renaissance Man")

The ship design was a modification of the Assault-class CGI model that had been created for "Tinker Tenor Doctor Spy". The ship was not specified as a survey vessel in the episode. For more information, please see VOY studio models.
Community content is available under CC-BY-NC unless otherwise noted.