This is one of our fuel safety cells/safety bladders after a 130mph accident. The fuel cell was forced half way across the car. The flexible composite material is just visible in the top left of the photo. No fuel was spilt! Under the Monza filler cap is a second cap that sealed the fuel. Also of note is the plate and nut-ring bent but remained sealed. We checked the cell over and it is back in the repaired car.