An incredible video was released on Facebook yesterday showed a massive piece of ice breaking off a glacier at Jökulsárlón Glacier Lagoon in Iceland’s south.

See the spectacular Jökulsárlón glacier lagoon for yourself with this incredible 5 day summer package

The video taken by Stephen Mantler, a tour guide, shows a massive sheet of ice breaking away from the Breiðamerkurjökull glacier before making a spectacular splash in the glacier lagoon.

Einstein’s theory of relativity is demonstrated in its pure form next, as the impact from the ice calving causes a small, icy tsunami.

The event known as ice calving is typically caused when a glacier expands. This process is basically how icebergs are ‘born.’

In the video, tourists can be seen quickly moving away from the water’s edge. Mantler told the Icelandic national broadcasting service, RÚV, that the noises coming from the visitors at the lagoon were sounds of excitement, not fear.

Another video posted to Facebook by a Háfjall tour company shows the same event, filmed from above with a drone. In this video, you can see smaller pieces of ice crumbling away from the side of the glacier before a massive shelf eventually drops with a considerable force into the water.

Get up close and personal with icebergs on a zodiac tour of the glacier lagoon

The calving of massive icebergs is usually accompanied by a giant cracking sound. The impact of the enormous block of ice hitting the water can make for an incredible sight, but it can also present a level of danger.

Above, another video of ice calving taken March 29

See also: Jökulsárlón tours

It’s important to take note of the sounds around you when visiting places like the Jökulsálón Glacier Lagoon. If you hear an unfamiliar cracking or booming sound, it could mean a new iceberg is about to be formed and you should step away from the water.

This is the perfect time to grab your camera or phone and document this natural process that very few people get to see in person. However, make sure you’re at a safe distance from the water’s edge first. When big things drop into a lake, they tend to make a splash, the splash normally makes a wave, and if you’re too close to the water, that wave might just swallow you whole.

Have you seen an iceberg birth at Jökulsárlón glacier lagoon? What was it like? Tell us in the Facebook comments below.