Hot air balloon flies underground into Earth for the first time ever
https://www-newz.blogspot.com/2014/10/hot-air-balloon-flies-underground-into.html
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.
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