A deep freight train rumble struck South Korea's capital as a series of landslides engulfed entire villages. Screams resounded from buildings as they were dragged down mud rivers. Drivers scrambled to their car roofs as entire portions of the highway were swept away.

Relentless rains have crippled the region, with some reports placing the death toll at 67. Thousands of police officers, firefighters and soldiers are scrambling to aid victims and search for potential survivors. But in some areas, rescue missions have been stalled due to another potential disaster: landmines. Between 1999 and 2006, the South Korean military dug up mines from the Korean War on Wumyeon Mountain in southern Seoul, but ten could not be located. Residents have been warned that these land mines could have been knocked loose by floods and debris. Authorities hope that a concrete wall resting near the mountain will hold back the missing mines.

While an army official told reporters that the lost ammunition posed no real danger, as the grenades are stored in wooden boxes and the mines are detached from their fuses, similar instances have resulted in deaths in the region. In 2010, floods carried a North Korean landmine into a river close to the border. Two South Korean men, who were fishing in the area, came across the mine. One instantly died, the other was wounded. Officials reported more than 30 mines had been swept into South Korea.  The Demilitarized Zone -- the two and a half miles dividing North and South Korea --  is littered with mines. Many unsuspecting villagers have come across the deadly weapons, losing arms, legs and, sometimes, their lives.

Both North and South Korea experience an annual rainy season, but this year's rains have proven to be the worst in a century. North Korea's widespread deforestation makes it even more vulnerable, with few trees to stop the powerful landslides. Aid and supplies have been distributed quickly around Seoul, but rescuers expressed concern over potential electrocution in flooded parking lots and construction sites. Over 4,500 people have been driven from their homes.

The water bombs, as some are calling the pounding rain storms, have stopped for now, but here's hoping the real explosives won't bear their ugly heads. 

YANG HOE-SEONG/AFP/Getty Images; PARK JI-HWAN/AFP/Getty Images; JANG SEUNG-YOON/AFP/Getty Images; Chung Sung-Jun/Getty Images; JANG SEUNG-YOON/AFP/Getty Images