Mysterious diver in Seoul's Cheonggye Stream identified

Tourists strolling along Seoul's Cheonggye Stream recently found themselves distracted by an unusual sight: a man in a black wetsuit gliding through the shallow water beneath the city's busy downtown streets.

Videos of the unidentified man with snorkeling gear have recently spread across social media, triggering curiosity about his identity and what he was doing.

One tourist who spotted the man while walking along the stream on May 28 posted a video on Instagram, writing, “Is that guy snorkeling ...