[1] Immersion tank
[2] Silent propulsion device
[3] Aft fuel-oil tank
[4] Walter turbine room
[5] Diesel engine
[6] Snorkel
[7] Periscope
[8] Conning tower
[9] Torpedo room and crew quarters
[10] Trimming tank
[11] Lubricating oil tank
[12] Regulation tank
[13] Ingolin (hydrogen-peroxide) tank
[14] Batteries
[15] Fore fuel-oil tank
[16] Commander's cabin
[17] Hydrophone room
[18] Radio room
[19] Maneuvering room
[20] Sideward torpedo tubes (aiming backward)
The Type XXVI was a design, based around the new Walter turbine moved by hydrogen-peroxide, which never entered service. It has been said that
this kind of fuel would render submarines to be one thousand times more expensive to operate.