NASA video shows cooling system for SLS megarocket

NASA has released a jaw-dropping video of the moment its deluge system dumps thousands of gallons of water onto Launch Pad 39B at the Kennedy Space Center. The space agency is prepping for the maiden voyage of the $8.9 billion Space Launch System (SLS) rocket, which will require roughly 450,000 gallons of water during ignition and liftoff to counteract the extreme heat and acoustics. In the incredible footage from this month's wet flow test, a torrential stream of water can be seen spewing straight up into the air and washing over the complex before dwindling to a trickle in just a matter of seconds. The latest wet flow test, shown in the footage above, was conducted on October 15 at the Kennedy Space Center's Launch Pad 39B. The SLS rocket will lift off with 8.4 million pounds of thrust, thanks to its four RS-25 engines and two solid rocket boosters.