Yes, they are secure. We use treated fabrics that enable flame-proof technology. The membrane is amazingly strong, nevertheless if intentionally cut, the constantly working air-turbines provide stability to the structure and the repair kit allows our customer a quick fix to these situations, and even if the damage was great, the structure is quite light (300gr/m2 apx.) and it would rarely compromise the security of the visitors. Low pressure inflatable structures are enormously secure, moreover if the basic guidelines are followed.