This is an every-four-year event that has gone on for centuries. Absolutely amazing!
This clip is of the spectacular. South American glacier, The Perito Moreno Glacier, which breaks up every four years like clock work, give or take a week. There are photographers from the four corners of the earth that come to southern Argentina and literally Camp Out at the glacier site in order to get the actual breakup on film. The individual who filmed this did a marvelous job.