Fig. 1From: Large-scale inflatable structures for tunnel protection: a review of the Resilient Tunnel Plug projectA conceptual overview of the RTP System: a Inflatable plug, unconfined configuration; b Tunnel profiles and folded plug storage areas; c Inflatable plug deployed and inflated in the tunnel (confined configuration); d Longitudinal cross-section, inflation and flooding pressures [42,43,44,45,46,47]Back to article page