Underwater projectile

Claim 1

A PROJECTILE ADAPTED TO BE FIRED BY GAS PRESSURE FROM AN UNDERWATER GUN THAT HAS A BARREL AND THAT IS ADAPTED TO HOLD A SOURCE OF GAS PRESSURE, SAID PROJECTILE COMPRISING AN ELONGATE TUBE ADAPTED TO HAVE ITS REAR END INSERTED IN THE BARREL OF THE GUN, AND HAVING MEANS AT ITS REAR END FOR MOUNTING AND CENTERING IT IN THE BARREL OF THE GUN, SAID TUBE BEING HOLLOW AND FORMING A CHAMBER FOR RECEPTION OF GAS FROM THE SOURCE IN SAID GUN TO PROPEL THE PROJECTILE FROM THE GUN, SAID TUBE BEING OPEN AT ITS REAR END WHEREBY WATER MAY ENTER, AND GAS BE ADMITTED FROM THE SOURCE INTO SAID CHAMBER, A PLUG SECURED IN SAID TUBE AT THE FORWARD END THEREOF AND CLOSING SAID TUBE AT ITS FORWARD END, SAID PLUG HAVING A DUCT EXTENDING THERETHROUGH AND COMMUNICATING AT ITS REAR END WITH SAID CHAMBER AND AT ITS OTHER END WITH THE EXTERIOR OF SAID PLUG, FOR CONDUCTING WATER FROM SAID CHAMBER UPON INTRODUCTION OF GAS UNDER PRESSURE INTO SAID CHAMBER, AND CLOSURE MEANS MOVABLY MOUNTED RELATIVE TO SAID PLUG AND MOVABLE ON SAID PROJECTILE IN OPPOSITE DIRECTIONS FOR OPENING AND CLOSING, RESPECTIVELY, SAID DUCT.