While working in an Air Force survival equipment shop testing and repacking twenty man life rafts, an old knowledable sargent hoisted a seventy pound CO2 cylinder to his shoulder and promptly dropped it. The valve head broke off when it hit the floor and the cylinder took off like a rocket, breaking almost through a cinderblock wall. Luckily no one got in its way. Storage and handling of compressed gas cylinders requires care and thought.
Maybe there could be a new ISSF discipline for aiming scuba tanks at targets and breaking off the valves. The 10 second string would be something to see.
I'm thinking that if you knock the valve off a scuba tank that's positioned on a steeply-angled ramp, then you could create the new sport of SCUBA tank trap.
If you could get two tanks to go off high and low ramps opposing each other, it could even become SCUBA tank skeet.