When you hop into a hot air balloon, you expect to fly up. Not anymore. For the first time ever, a hot air balloon was successfully flown down and underground into the Mamet Cave in Croatia. Even better, it was a 70-year-old man who accomplished the feat, dipping down nearly 700 feet into Earth.
via Gizmodo http://ift.tt/ZDhbvF http://ift.tt/1ukRHhW
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