June 25th, monster calving events happened.

A 400 foot tall calving face breaking off.

This is a view of what's called the calving face.

Helicopter in front of the calving face for scale, quickly dwarfed.

A mile of retreat in 75 minutes across the calving face, in that particular event, three miles wide.

A mile of retreat in 75 minutes across the calving face, in that particular event, three miles wide.

We just downloaded these pictures a couple weeks ago, as you can see. June 25th, monster calving events happened.

If you look in the middle background, you can see the calving face bobbing up and down like a yo yo.

Okay. We had a team out watching this glacier, and we recorded the biggest calving event that's ever been put on film.

To give you a little bit of a sense of scale, that calving face in this picture is about 325 feet tall.

We have some cameras on the south edge of the Ilulissat, watching the calving face as it goes through this dramatic retreat.

Okay. We had a team out watching this glacier, and we recorded the biggest calving event that's ever been put on film.

To give you a little bit of a sense of scale, that calving face in this picture is about 325 feet tall. That's 32 stories.

The calving face is the wall where the visible ice breaks off, but in fact, it goes down below sea level another couple thousand feet.

The calving face is four and a half miles across, and in this shot, as we pull back, you're only seeing about a mile and a half.

The block was three fifths of a mile deep, and if you compare the expanse of the calving face to the Tower Bridge in London, about 20 bridges wide.