Footage has emerged of a huge "iceberg tsunami" off the coast of Greenland that threatened to swamp a tourist boat.
The incident happened at the Ilulissat Icefjord, a Unesco World Heritage Site.
The video shows the crumbling iceberg creaking and cracking before a huge shelf shears off creating the massive wave.
The BBC said the video was captured by Jens Moller, the nephew of the captain.
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