Multiple realities
(covers information from several alternate timelines)
For the starship, please see USS Tranquillity Base.

The Defiant's dedication plaque

Tranquility Base was a location on Luna, part of Mare Tranquillitatis ("the Sea of Tranquility"). In 1969, the area was the site of the first Human moon landing by Apollo 11's Lunar Module Eagle. (TOS: "Tomorrow is Yesterday")

By the 23rd century, a Starfleet shipyard was located there. Among the ships built there was the USS Defiant. (ENT: "In a Mirror, Darkly")

By 2364, a starship had been named for this location. (TNG: "Conspiracy", okudagram)

Mirror universeEdit

In the mirror universe, in the mid-2250s, the ISS Discovery was constructed at this universe's equivalent of the base. The base was mentioned on the ship's dedication plaque. (DIS: "Despite Yourself")

According to the dedication plaque seen on the bridge of the Defiant, this is where the ship was constructed, though this was never mentioned in dialogue.
In the Ships of the Line book, the Defiant's sister ship, the USS Excalibur, was, according to a dedication plaque, commissioned at this base as well.
According to technical data prepared for the San Diego Comic Con in 2018, the ISS Shenzhou was constructed at this base. [1]

External linksEdit

Community content is available under CC-BY-NC unless otherwise noted.