These photos prove WWI-era naval architects did acid
This photograph shows the submarine's four bow torpedo tubes and hydroplane on the port side. | Tyne & Wear Archives & Museums
The following images, provided by Tyne & Wear Archives, show the heart of a World War I German submarine that sank in 1918 after it was rammed by a torpedo boat destroyer.
Here are photos from the control room of a salvaged UB-110 submarine.
This photo shows the manhole to the periscope, hand wheels (for pressure), and valve gauges:
Here's the submarine's hydroplane gear, depth gauges, and fuel-tank gauges:
More hand wheels for managing air pressure and engine telegraphs:
The submarine's gyrocompass, steering control shaft, engine telegraphs, and voice pipes are visible in this photo: