Poseidon 8 was a sub-aquatic community designed and constructed to farm the sea bed. (GAME: Shadows of the Vashta Nerada) It was built on the former site of London after three quarters of the Earth's land was flooded in the 23rd century. (GAME: TARDIS) The wreck of the USS Eldridge was unintentionally placed nearby. (GAME: Shadows of the Vashta Nerada)