Watch: Sinkhole opens in South Korea swallowing two people whole

Terrifying natural phenomenon was reportedly captured on surveillance tape in South Korea

The couples' terrifying disappearance was captured on camera (Youtube, screengrab)

A South Korean couple's terrifying ordeal was captured on camera after a sinkhole opened directly underneath their feet - and swallowed them whole.

The terrifying natural phenomenon is believed to be caused by land erosion. Sinkholes are common in areas where the rock beneath the surface is sandstone, quartzite or limestone. Carbonate rock types are prone to weakening from the circulation of ground water, causing them to dissolve and unexpectedly collapse - resulting in sinkholes.