Icebergs are massive pieces of compressed ice and snow that drift along in open water. Their traditional white-gray color results from the densely-packed snow, and they are stunningly-beautiful!

But, if there is a high enough pressure to actually squeeze and forge the individual snow flakes together, or if the iceberg section is immersed in water, the structure changes to a dark blue-green color. The spaces in-between snowflakes fill in and freeze, to create a solid chunk of homogeneous ice.

In December 2014, photographer Alex Cornell got a peek at the underside of an iceberg in Antarctica, and snapped a few rare photos!

The foreground of the image below shows a traditionally white-colored iceberg, while the background shows the deep blue-green color of an overturned iceberg.



While these images do look beautiful, it's easy to forget just how dangerous these chunks of ice can be.

The videos below show this rare flipping process in action!

As this cruise ship was passing through a Fjord, one lucky tourist had his video camera recording. This is one of the most gentle iceberg flipping events that we've seen. Watch the birds fly away just at the last moment!
And this Iceberg below was "calved" by Argentina's Uppsala glacier - It's a little more violent.