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USS Defiant in Tholian drydock, 2155

The USS Defiant in a mirror universe Tholian spacedock

USS Voyager in drydock

USS Voyager in drydock

USS Enterprise approaches Spacedock

The Enterprise approaches the Earth Spacedock

A spacedock, or drydock, was a facility capable of docking starships for maintenance. Most spacefaring species had some type of spacedock, and they thus varied widely in design. The United Federation of Planets and United Earth had spacedocks that most often took the form of a free-standing, orbital, single-starship-sized "cage". This form of spacedock was virtually synonymous with the word drydock. Generally, these cage designs were used for major construction or refits and could be part of a shipyard.

Some spacedocks, however, were part of starbases and outposts, and allowed for more secure repairs in a totally enclosed, multi-functional facility. The USS Excelsior enjoyed at least the final stages of its construction in such a facility orbiting Earth.

In the mirror universe year 2155, the Tholians took the USS Defiant to a spacedock built into an asteroid-moon in orbit around a gas giant and began a salvage operation, but were unable to finish because the ship was stolen by Commander Jonathan Archer of the ISS Enterprise. (ENT: "In a Mirror, Darkly")

In 2371, all of Earth's spacedocks were erased from existence after the death of Gabriel Bell in 2024. They, and the correct timeline, were restored after Benjamin Sisko assumed Bell's identity and successfully brought the Bell Riots to their original conclusion. (DS9: "Past Tense, Part I", "Past Tense, Part II")

The Utopia Planitia Fleet Yards contained a number of drydocks. The USS Voyager spent some time in a drydock at Utopia Planitia before its launch in 2371. (VOY: "Relativity")

In 2373, Starfleet and the Klingon Defense Force attacked and destroyed the Cardassian spacedocks on Torros III. (DS9: "Call to Arms")

Also in that year, Chief Miles O'Brien told Captain Sisko that a spacedock would be a better place to repair the USS Defiant than Deep Space 9 after Michael Eddington's cascade virus damaged the ship. (DS9: "For the Uniform")

There were also spacedocks in orbit of Trelka V in the 2370s. Three Template:ShipClass starships were docked there in 2375 when Martok led the attack on the Trelka starbase. (DS9: "Once More Unto the Breach")


Related topics

Background information

  • The first mention of a spacedock is in "The Doomsday Machine".
  • The terms "Spacedock" and "Drydock" have been used interchangeably to describe the same structures. NAR-30974, the facility the USS Enterprise-B was launched from in Star Trek Generations, had markings saying it was a "Starfleet Drydock" while the script and dialog used "spacedock." Voyager launched from a similar, if smaller, facility that was referred to as a "drydock" in dialog and the scripts in the episode "Relativity".
  • Very little is known about the enclosed spacedocks seen in the Star Trek films and TNG episodes. Their dimensions, internal layout, regular and maximum compliment, and if the spacedock is open to civilians or if it is restricted to Starfleet personnel is unknown.
  • There seem to be very different sizes of the enclosed spacedocks, despite having the same basic "mushroom" design in the 23rd century as they do in the 24th. It is known, for instance, that some can accommodate a Template:ShipClass starship, although the facility seen in the movies – whose space doors seem barely wide enough to accommodate the Enterprise – seem able to admit nothing larger than an Template:ShipClass vessel. This is because stock footage of the original Enterprise entering the dock was superimposed with the new, larger USS Enterprise-D entering the same port.

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