It starts with a towering wave exploding against the black volcanic sand and jagged basalt columns. Then the whitewater surges up the beach, swallowing everything in its path. Suddenly, a young girl disappears beneath the rushing water. The terrifying footage was captured October 14 at Reynisfjara, Iceland’s notoriously dangerous black-sand beach, where enormous, unpredictable waves have claimed multiple lives. See the harrowing video of the recent incident below. View this post on Instagram According to Icelandic broadcaster Vísir , tour guide Heiðrún Hauksdóttir filmed the incident involving a family of four, including two children, who were caught by the powerful surge. “I saw the wave coming much closer,” Hauksdóttir recalled in an interview with Morgunblaðið , translated from Icelandic.…