The forward torpedo room on U475, the "Black Widow", an ex-Russian hunter-killer submarine, currently moored in the Medway at Rochester. The sub was built in 1967 and retired from active service in 1994. She carried a crew of 77 and was armed with 22 torpedoes including 2 with nuclear warheads.
The submarine lists to one side - the apparent tilt in the image is not a fault with the panorama. It is not currently open to the public.