Atlantis

Galleia stands among the ruins of Atlantis (DW: The Time Monster)

You may be looking for the space shuttle Atlantis.

Atlantis was an ancient civilisation located on the island of Thera. It had flourished in part due to the Kronos Crystal, which had been given to them by the Dæmons. (PDA: The Quantum Archangel)

Before Atlantis' destruction, the civilisation had advanced spaceflight and had reached worlds as far away as Vortis in the Isop Galaxy. (DWAN: The Lost Ones)

Circa 1500 BC, Atlantis was destroyed when the Master released Kronos, despite the Third Doctor's attempt to intervene. (DW: The Time Monster)

Some Atlanteans survived beneath the ocean, off the Azores. In 1970, Professor Zaroff discovered the surviving Atlanteans and proposed to raise their settlement from the ocean floor. This would have destroyed the Earth. He died in the attempt due to the Second Doctor's intervention. (DW: The Underwater Menace)

Azal later pointed to the destruction of Atlantis as a warning as to what might happen if he considered Earth a failed experiment. (DW: The Dæmons)

Atlantis was an exhibit in the Museum of Things That Don't Exist. (EDA: The Taking of Planet 5)

The Fourth Doctor compared Nerva Beacon to Atlantis; they were both the subject of legend. (DW: The Sontaran Experiment)

The Seventh Doctor once said that there were three "Atlantises" and that he had visited all of them. (NA: Transit)