>>1284586The most commonly used lifting gas, helium, is inert and therefore presents no fire risk.[143] A series of vulnerability tests were done by the UK Defence Evaluation and Research Agency DERA on a Skyship 600. Since the internal gas pressure was maintained at only 1–2% above the surrounding air pressure, the vehicle proved highly tolerant to physical damage or to attack by small-arms fire or missiles. Several hundred high-velocity bullets were fired through the hull, and even two hours later the vehicle would have been able to return to base. Ordnance passed through the envelope without causing critical helium loss. In all instances of light armament fire evaluated under both test and live conditions, the airship was able to complete its mission and return to base
Also, it's not hard for them to spot where the fire is coming from. You'll get your ass busted and go to jail for a long time.
