As soon as you were in a catastrophic accident, all your hydrogen would vanish.
You would have a bottle of highly compressed hydrogen somewhere. The bottles can be designed so they don't explode when damaged, but it would take a non-zero amount of time for the hydrogen to escape. For however long that takes, you have a jet of escaping pure hydrogen that would make an excellent blowtorch if anything resembling a flame or spark gets too close.
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As soon as you were in a catastrophic accident, all your hydrogen would vanish.
You would have a bottle of highly compressed hydrogen somewhere. The bottles can be designed so they don't explode when damaged, but it would take a non-zero amount of time for the hydrogen to escape. For however long that takes, you have a jet of escaping pure hydrogen that would make an excellent blowtorch if anything resembling a flame or spark gets too close.
"You would have a bottle of highly compressed hydrogen somewhere."
http://www.fueleconomy.gov/feg/fcv_benefits.shtml shows another option for storage (Materials-based storage) that will probably be safer.