Pure compressed hydrogen was piped from a tanker into the Ford's boot-cramming, cylindrical fuel tank at a pressure of 5,000 pounds per square inch. Minutes later, we were on our way, carrying enough fuel to take the Focus 200 miles. Stringently tested 10,000psi tanks are in the offing and will double that range, so it almost seems as if the future has arrived sooner than expected. This, from the article.. 10,000 psi tanks and an invisible flame (if ignited) ?!.
As mentioned earlier, H2 might not be too safe in an underground garage or tunnel, etc (nowhere for the gas to rise to).. I don't know , but these sound like reasonable safety issues that would have to be addressed,... right?