This water gun can cut through concrete

How do firefighters put out a blaze when they can't reach the flames?

That's the challenge firefighters confronted in 2008, when a B-2 Stealth Bomber crashed on the runway at an American airbase in Guam.

The crew successfully ejected, but the hugely expensive aircraft was completely destroyed by a fire that burned deep within its wreckage.

"The firefighters had difficulty getting through the composite layers of the aircraft skin to fight the fire," U.S. Air Force Chief Master S...