Have you ever seen so many valves? I count at least 23!

You are looking at the control room of the UB-110 German Submarine (looking aft, starboard side). The photograph was recently uploaded to Flickr Commons by the Tyne & Wear Archives & Museums.

According to the description:

This image shows manhole to periscope wall, valve wheels for flooding and blowing. Hanwheels for periscope gear, air pressure gauges. The UB-110 sunk after attacking a merchant shipping convoy near Hartlepool in July 1918. It was then salvaged and transferred to Swan Hunter Wigham Richardson Ltd. Dry Docks (Wallsend), with an order to restore her to fighting state. The order cancelled following Armistice and she was scrapped thereafter.
 
Taken from the Swan Hunter and Wigham Richardson Ltd. Shipbuilders Collection in November of 1918. Reference no. DS.SWH/5/3/2/14/1/26