Awe-inspiring footage showing an enormous iceberg flipping over in South American waters has been sweeping the Web.
During the clip, the bottom edge of the iceberg is seen slowly emerging from the ocean – sending water rushing down its sides.
The excitement of the tourists can be heard in the background as the iceberg flips over at Los Glaciares National Park, Argentina.
Osi Baruch, who filmed the event, provides a description of the video on YouTube, in which he explains how the iceberg was “calved” by Argentina's Upsala Glacier.
He says: “While we were passing by it with a catamaran, the huge berg lost a part of itself (look at the right side sinking) and then flipped over with a huge roar.
“In the process of melting this happens all the time, but it is seldom that it is captured on video when it happens...”
Iceberg calving is the sudden release and breaking away of a mass of ice from a glacier.