HMS Alliance, Royal Navy Submarine Museum, Gosport, 2 September 2013 8. Engine room, with two 2150 hp Vickers diesels. They ran at 450rpm, and could drive her at up to 18.5 knots on the surface. Two battery-powered 625hp electric motors gave a speed of 8 knots underwater.
![Biber [Beaver] midget submarine 105, Royal Navy Submarine Museum, Gosport, 2 September 2013 1. One-man midget submarine with external torpedoes developed in desperation by the Germans in 1944. 324 built. Many were lost on operations but they achieved very little.](https://photos.smugmug.com/Ships/Royal-Navy-Submarine-Museum/i-4SfJnqR/1/a6e33b18/Ti/2013-09-02_2698nc11iw-Ti.jpg)
![Biber [Beaver] midget submarine 105, Royal Navy Submarine Museum, Gosport, 2 September 2013 2.](https://photos.smugmug.com/Ships/Royal-Navy-Submarine-Museum/i-4hcRFFq/1/5e9d9ba1/Ti/2013-09-02_2704nc11ivw-Ti.jpg)
![Biber [Beaver] midget submarine 105, Royal Navy Submarine Museum, Gosport, 2 September 2013 3. Several Bibers survive, but this is the only operational example. It was restored to working order in 2003 for the Channel 4 Salvage Squad TV programme.](https://photos.smugmug.com/Ships/Royal-Navy-Submarine-Museum/i-jrjxqkf/1/626363f0/Ti/2013-09-02_2720nc11ivnw-Ti.jpg)
