The flow began in the ceiling corner of the room at Yonsei University. Students could be seen rapidly gathering their belongings together and preparing to leave. Then suddenly a deluge appeared from a crack in the wall pouring forcefully down onto the desks and causing the filmer to panic.
Then the whole side of the wall collapsed, with a mirror smashing as an enormous cascade of water tumbled into the library. According to the Korea Herald the flood was the work of North Korea after the county released water from the Hwanggang dam near its border with the South without warning.
“They appear to have opened the gates step by step and the amount of water discharged increased,” a military official said. Satellite images also found that the breadth of waterways in the region had widened from the previous 80 meters to 280 meters.
The unilateral release defied a 2009 agreement under which the North promised to give prior warning to the South of any discharge at the dam. However, South Korean military didn’t see it as a flooding attack, given recent downpours and past cases.