Launch Pad Water Deluge System Test at NASA Kennedy Space Center

From Youtube
This system is used to reduce extreme heat and energy generated by a rocket launch. On Oct. 15, 2018, the Ignition Overpressure Protection and Sound Suppression water deluge system at Kennedy Space Center’s Launch Pad 39B was tested, sending water about 100 feet in the air. The test is part of preparation for launching our Space Launch System rocket on Exploration Mission-1 and subsequent missions.