USS Eldridge

The USS Eldridge was a ship used in Earth's second world war to escort goods to North Africa and Europe.

History
The Eldridge was part of 'The Philadelphia Experiment', which was supposed to make the ship invisible. However, the project bent the laws of time and space and caused the ship to travel through time. The crew who didn't die were sent insane. The Time Lords tried to stop the project, but were scuppered when the ship fell through a dimensional rift and ended up on the sea floor.

For some reason, the ship let loose a blast of Vortron Energy and brought Vashta Nerada and a mysterious illness to the crew of Poseidon 8 in the 23rd century. The gateway caused by the ship was closed by the the Doctor and Amy Pond. (VG: Shadows of the Vashta Nerada)