shows a single launching tube 20 it is understood that the launcher system to be described may be connected to a plurality of such tubes by using well known submarine piping and valving arrangements so as to direct the ejected fluid to one or more preselected launching tubes in the single launching tube version illustrated in fig1 a flow controlling slide valve 16 is provided adjacent the breach end 35 of the launching tube 20 a cylindrical projectile 21 is provided on slidable chocks 21a so that the slide valve 16 is adapted to provide pressurized fluid between the breach end 35 of the launch tube 20 and the aft end of the projectile 21 the launch tube also includes a muzzle valve 24 at the launch end of tube 20 the breach end 35 can be opened from within the submarine 39 s inner hull 34 the slide valve 16 can also be operated from within the hull 34 by conventional means not shown so too the muzzle valve 24 is remotely operable from within the submarine itself a plurality of projectiles not shown are generally stored within the inner hull and can be selectively maneuvered into position within the launching tube 20 in further accordance with the present invention a.