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Published 12:22 1 Oct 2014 BST
Updated 08:06 18 Dec 2014 GMT

Trifonov pictured flying into the cave.
Trifonov was the first man to try, and succeed at, this adventure. He flew into the cave, touching it’s bottom before flying out again.
He had to use a specially-designed hot-air balloon for the feat which was smaller then normal.
Trifonov has already hot air ballooned over the North Pole, the South Pole and the Mediterranean sea.
He was also the first man to stand, dive and fly over the North Pole – all within 12 hours.
https://www.youtube.com/watch?v=b0RtZL06EbI
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