Overseer-class Research Saucer
From Star Trek: Theurgy Wiki
Overseers were a sturdy class of survey vessels built for undetected observation. The KRK-9009 series was built specifically to observe pre-contact species on class H, M, O, and P planets. During the Sheromi contact with Asurians, many motherships still held MK IV versions of the ships despite their decommissioning. The Asurians now fly a handful of these saucers for the purpose of pirating and battle.
The Overseer class is infamous for having started the pop-culture fad of 'flying saucers' on Earth. Sheromi used the MK IV saucers for observing humans and consequently left an imprint of their ships in human culture. A handful of younger cultures also share the same cultural phenomenon for the same reasons.
Production History
The Sheromi employ a number of research and exploration vessels in their never-ending mission to continue what the Preservers started, but dependable spacecraft were scarce. Their older ships did not often survive the transition from space to an atmosphere, and if they did, their observational ships would sometimes be spotted, which would make much of their research invalid. In civilizations with primitive weaponry and aircraft, they found that their older ships could not leave fast enough. Often the ship would be damaged, the sensitive, fragile instruments inside would be damaged, or they'd lose the ship altogether. The Overseer class arose from the need for a quiet, stealthy scientific vessel that would remain largely untouched by the kinetic weaponry of most primitive alien civilizations.