23rd century

The  was when global warming finally caught up with the Earth. Three-quarters of the planet's landmass was drowned by water. Humans built islands and colonised parts of the oceans for research and other uses. London was totally flooded. (VG: TARDIS) Venice prepared to finally submerge into the waters of the Laguna. (BFA: The Stones of Venice)

Adding to Earth's suffering was a fifty year war between humanity and what were quite possibly the Daleks. (PDA: Salvation)

Late in the century, the First Doctor landed his TARDIS near the Mechanoid City on the planet Mechanus, where a human captive, Steven Taylor, was held prisoner. After a fight between the Mechanoids and the Daleks, Steven Taylor left the planet in the TARDIS. (DW: The Chase)

Elsehwere on earth, the underwater base Poseidon 8 was invaded by the Vashta Nerada, infected with an illness and attacked by a rampaging alien shark. During an unknown Yuletide season, the Eleventh Doctor found a cure for the illness, while Amy helped him send the shark and Vashta Nerada back to their rightful times and places. (VG: Shadows of the Vashta Nerada)