From KBDiverServices: Tanks don’t just explode for no reason. In fact, tanks should never explode if the burst disc is in place and functioning. Certainly heating and overfilling can cause a danger, but if the burst disc is in place, then it should rupture before the tank does. Most tanks that do rupture - do so during filling and occur when filling station attendants fail to fill at a proper rate and overfill the tanks. Tank explosions while being carried are very rare indeed. They happen most often during filling, followed closely by being stored in hot environments such as cars in direct sunlight and garages without environmental controls. Make sure burst discs are checked when visual inspections are done. Most dive shops fail to remove and inspect burst discs. I’ve actually seen some bone head divers remove burst discs and replace with burst discs rated for higher pressure tanks. This is a big no no. They do this so they can overfill the tanks without the burst disc blowing... beware when buying used tanks with used valves. Always ensure the burst disc is the proper one for the tank.