A tourist has captured some rare and startling video of an iceberg tipping over. The tourist was traveling on a boat near the Upsala Glacier in Argentina and caught the unexpected moment.

Writing on YouTube under the name "osibaruch," the tourist says:

"While we were passing by it with a catamaran, the huge berg lost a part of itself (look at the right side sinking) and then flipped over with a huge roar. In the process of melting this happens all the time, but it is seldom that it is captured on video WHEN it happens..."

The Upsala Glacier has been melting for a number of years and is often cited as evidence of global climate change. The BBC reports that the glacier, once the largest in South America, has been retreating at a rate of about 600 feet a year. Some scientists say the melting of Upsala is a result of other natural factors and is not primarily connected to climate change.

The tourist originally captured the video in March but first posted it online this week.

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