ESS Quetzel

The ESS Quetzel, also known as The Shuttle, is a reusable nuclear-powered spacecraft built before the Great War.

Background
The Quetzel is located in the ruins of San Francisco, on the remnants of the Golden Gate Bridge, though it lacks either rocket boosters or an external fuel tank; a quest involves finding fuel for it.

There are three endings for the Hubologists regarding the shuttle that is inaccessible due to incomplete scripting. If the Chosen One does not get the fuel, the Hubologists use a cheap alternative, resulting in the shuttle exploding during liftoff. If they get fuel, the liftoff is without complications, but the shuttle's air insulation is damaged, resulting in the Hubologist crew suffocating in space. There is another ending that can trigger where they launch without issue, perishing due to not accounting for the use of recycled air onboard.

Behind the scenes
Pressing the 5 key at the San Francisco map will bring the player character to a location with an "UNUSED ART" room - the shuttle interior. Attempting to examine certain things will make it say there is a shuttle wall. It is impossible to leave this area other than reloading an earlier save.

Appearances
The ESS Quetzel appears only in Fallout 2.