torpedo tube

torpedo tube is a Noun

Definition:

[1] A tube fixed below or near the water line through which a torpedo is fired, usually by a small charge of gunpowder. On torpedo vessels the tubes are on deck and usually in broadside, on larger vessels usually submerged in broadside and fitted with a movable shield which is pushed out from the vessel`s side to protect the torpedo until clear, but formerly sometimes in the bow. In submarine torpedo boats they are in the bow.