- You may be looking for the space shuttle Atlantis.
Atlantis was an ancient civilisation located on the island of Thera.
An underwater Atlantean outpost survived beneath the ocean, off the Azores. In 1970, Professor Zaroff discovered the survivors and proposed to raise their settlement from the ocean floor. This would have destroyed the Earth. Zaroff died in the attempt due to the Second Doctor's intervention. (TV: The Underwater Menace)
Later, the Dæmon Azal pointed to the destruction of Atlantis as a warning as to what might happen if he considered Earth, a planet that the Dæmons had helped along, a failed experiment. (TV: The Dæmons)
Other locations of the same name Edit
The Epoch created a world that was very similar to Atlantis. It was destroyed by Bernice Summerfield and Ruth. (AUDIO: The Kraken's Lament, The Temple of Questions, Private Enemy No. 1, Judgement Day)
Minor references Edit
The Sixth Doctor once told his companion Flip that there were several versions of Atlantis. (AUDIO: Antidote to Oblivion) The conflicting locations of Atlantis were later used to confuse the directional computer of the Scavenger. (AUDIO: Scavenger) In the Doctor's next incarnation, he mentioned that there were three "Atlantises" and that he had visited all of them. (PROSE: Transit) Among the various visits made by the Doctor across the globe in the past, three possible versions of Atlantis were noted by Jac as UNIT in the 2010s compiled a list of his appearances in order to deduce where the Twelfth Doctor had gone for his final destination. (TV: The Magician's Apprentice)
Behind the scenes Edit
Noting this, former Producer Barry Letts' noted in his introduction to the first edition of The Doctor Who Programme Guide that Atlantis had three different and incompatible explanations for its destruction. The line in Transit references this. This point would later be enforced in two Big Finish audio plays, and an off-hand reference made on television in The Magician's Apprentice to "three possible versions of Atlantis".