Sinkholes are especially common during two critical seasons: spring, when frozen ground thaws, and summer, when heavy rains soak and erode underground soil. Government data shows that, since 2018, nearly 76 per cent of all sinkhole incidents occurred during these two periods alone – 371 cases in spring and 647 in summer.

A motorcyclist who fell into a massive sinkhole that opened up on a street in Seoul was found dead after an overnight search.

A motorcyclist was found dead Tuesday around 18 hours after he vanished into a massive sinkhole that opened up in Seoul, South Korea’s largest city.