So it has hydrogen, its still got the same energy as a tank of gas! - thats the point it its enough energy to drive a 1tonne lump 270miles (not straight up!)

Hindenburg Burnt = so do oil wells (see iraq)

5000psi means nothing without OXYGEN

Watch The H2 Tank Tests ON youtube they do not pop like ballons they split and leak, now the exposed H2 burns just like petrol burns! the thing is there is NO OXYGEN in the tank (unlike a petrol tank) so no explosion...

another good thing is that if the H2 leaks and does not ignite it floats away the scene is safe within minutes..