The Concrete Canvas Tent.

British scientists Richard Ambrose and Jonny Phillips demonstrate how quickly a concrete canvas shelter can be built. The concrete canvas shelter arrives folded in an bag, its then soaked with 800-1000 liters of water, drug out and inflated to a building 50 square meters in size. In just 24 hours the cloth hardens and becomes an extremely solid, water proof and fire proof structure.
[NationalGeographic] [Via]

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