I understand some of the issues and concerns using the different systems, but even a scuba tank, if properly installed will not become a projectile. Have you ever actually seen one go off when the regulator was broken? If you looks closely, the exit point for the air from a scuba tank is on the SIDE of the neck, so really all that would happen is a loose tank turning in circles. Not quite that simple, but pretty much the results. I have a Compressed air tank (scuba) and enjoy the fact that it lasts for several MONTHS before needing to be refilled. I use it to air up tires as well as run air tools. ANY tank can become dangerous if not installed or used properly.