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Published on 24 Feb 2015 | about 1 year ago

From terrifying home-swallowing sinkholes to picturesque natural caverns, we count fifteen awe-inspiring planetary cavities
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Image credits & information sources for this video: pastebin.com/YG9cVvvd
Planet Dolan PTY LTD and Danger Dolan™ have made reasonable inquiries within the timeframe available to identify the source of any images used and attribute the source accordingly.

Background audio copyright Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 3.0
creativecommons.org/licenses/by/3.0/

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