In this challenge, the teams must build a giant water pistol (like a Super Soaker) to shoot down letter s that spell out O-P-E-R-A-T-I-O-N J-U-N-K-Y-A-R-D. The letters are 7 feet off the ground and fifteen feet away from their gun. It's also placed over the heads of the opposing team.

Both teams team are going to fill a container (the reds will use a pipe, the blues a scuba tank) with water and seal it. They will then use bike pumps to force air into the container which will force the water out through a hole in the bottom. A hose will be attached to the hole and the water will squirt out the end, hopefully knocking the letters over. At the end of the hose will be a release valve which will keep the pressure in the system until it is opened, releasing the pressure (and the water)
 

fr l to r; Kailey, David, Mezzy and Captain James	from l to r; David, Alan, Brian and Captain Peter
The blues are pressurizing a scuba tank to make a bazooka blaster	With a pipe pressurized, the reds will raise it up for shootin'
Blue got one bodgit and chose the Trunk of Junk	Red found all cogs earning all three bodgits
Clint point out that a bucket it too flimsy and that a pipe might be a better choice	The Blues make a valve assembly that should allow water to get in and let them apply pressure to it
Teflon tape is wrapped around the pipe threads to help seal it	Blue tightens a valve onto the tank
Blue gets ready to do some welding to make a frame	A test proves...to be a blast-off... er...it's a success
Blues add water to their gun	Both teams are pumping away
Red gets off the first shot	Uhh...blue?
Well...that was, uh, quick	Red wins, knocking the letter over before Blue could even fire once

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