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http://www.livestrong.com/articl ... ydrogen-fuel-cells/
Explosive Danger
Hydrogen is explosive at high concentrations, but its tendency is to burn rather than to explode. That property doesn’t eliminate the explosive danger entirely, but it renders it as safe as any volatile material that is used as fuel. Hydrogen tanks have been subjected to rigorous testing and worst-case scenarios. In a study published in the November 1996 issue of "The New Scientist," physicist Rob Edwards tested a full hydrogen tank by engulfing it in a 1600-degree flame for 70 minutes without incident. He also punctured a tank with armor piercing bullets. The hydrogen sometimes burned and sometimes dissipated, but it did not explode.
http://www.evworld.com/article.cfm?storyid=482 Hydrogen Car Fire Surprise
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