Poseidon 8

Poseidon 8 was a sub-aqautic community designed and constructed to farm from the sea bed. When a bright light appeared, the base came under attack from a non-terrestrial fish, a sickness and the Vashta Nerada and was therefore placed on lock-down. 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 mushroom and 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. The Doctor eventually helped to return the Vashta Nerada and other threats to their regular time and place.