Stacked Buoyant Payload Launcher

A submarine buoyant payload launcher system includes support rails extending longitudinally along an interior surface of a submarine missile capsule. A plurality of hold downs are spaced along the length of each rail and are retractable into the support rails. Once a payload is in position within the rails, the hold downs adjacent to the top end of the payload are rotated to their closed position, so as to contact the payload. Another payload can then be loaded within the rails until the payload contacts with the closed hold downs. As in the case of the first payload, the hold downs adjacent to the top end of this next payload are rotated to their closed position. Multiple payloads can be loaded within the rails in this manner.