Poseidon 8

Poseidon 8 was a sub-aqautic community designed and constructed to farm from the sea bed. It was unintentionally placed by the wreck of the USS Eldridge.

History
When a bright light appeared, the base came under attack from a non-terrestrial shark-like fish, a sickness and the Vashta Nerada and was therefore placed on lock-down by the artificially intelligent computer. The Doctor, however, was able to access the lobby of Sector A using the sonic screwdriver, who also reactivated the power generator. Amongst the foods harvested by Poseidon 8 were sea pumpkins, sea sprouts, sticky mushrooms and brine oils. Some of these aided The Doctor in finding a cure for the sickness. Under the base were many access tunnels, which can be used if another sector comes inaccessable. After discovering the wreck of the USS Eldridge, which held a gateway through time and space, the Doctor eventually helped to return the Vashta Nerada and other threats to their regular time and place. (VG: Shadows of the Vashta Nerada)