Atlantis Atlantis was an ancient civilisation located on the island of Thera . History . It had flourished in part due to the Crystal of Kronos , which had been given to them by the alien Dæmon s . ( PROSE : " The Quantum Archangel " ) Before Atlantis ' destruction , the civilisation had advanced spaceflight and had reached worlds as far away as the planet Vortis , located in the Isop Galaxy . ( PROSE : " The Lost Ones " ) Circa 1500 BC , Atlantis was destroyed when released the chronovore Kronos . ( TV : " The Time Monster " ) 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 " ) Atlantis was an exhibit in the Museum of Things That Don ' t Exist . ( PROSE : " The Taking of Planet 5 " ) One of Clara Oswald ' s splinters was an inhabitant of Atlantis . ( COMIC : " Blood and Ice " ) Cousin Octavia visited Atlantis while working for Faction Paradox . ( PROSE : " Warring States " ) Other locations of the same name . 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 " ) In Roma I , Atlantis was a sea city in the Roman Empire . ( PROSE : " Warlords of Utopia " ) Minor references . 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 " ) The Fourth Doctor compared the " lost " human space station Nerva Beacon to Atlantis ; they were both the subject of legend . ( TV : " The Sontaran Experiment " ) He later recalled the Atlanteans as one of the civilisations which had created twisting underground passageways which he had to run up and down . ( PROSE : " A Device of Death " ) The Time Agency and the Hokrala Corp were both involved in the sinking of Atlantis . The event was considered a failure for the Time Agency . ( PROSE : " The Undertaker ' s Gift " ) Behind the scenes . The various televised Whoniverse visions of Atlantis , or at least the ones presented in " The Underwater Menace " , " The Dæmons " , " The Time Monster " , do not necessarily mesh particularly well together . 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 " .