Saddle tank (submarine)

The German submarine U-995 at the German Navy memorial at Laboe, showing the starboard saddle tank as the elongated bulge along the side of the submarine

Saddle tanks are a type of ballast tank configuration fitted to submarines.

Saddle tanks are fitted in pairs external to the pressure hull, one on each side, in a similar manner to that of a horse's saddle-bags, the positioning of which they resemble in appearance.