This might be true for leaks in ventilated spaces, but I am really scared by the idea there could be a hydrogen leak in an underground garage. Also, in the case

This might be true for leaks in ventilated spaces, but I am really scared by the idea there could be a hydrogen leak in an underground garage. Also, in the case of a traffic accident, we are talking about a high pressure tank, so the risk of the tank failing structurally is much larger than with the unprepared fuel tank. Finally, hydrogen is much easier to light than fuel.