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The 70-year-old daredevil, in association with the Croatian tourism board, completed the feat at the Mamet Cave near the country's west coast.
This was a once-in-a-lifetime opportunity for me to visit Tartarus (hell), right?
It has been an incredibly difficult project. You must have the right balloon, the right weather, and the right support. I don't believe this is going to be repeated by anyone ever again.
Trifonov, who was born in Austria but is now a Croatian national, has already hot air ballooned over the South Pole, the North Pole, and the Mediterranean Sea, was the first man to stand, dive and fly over the North Pole all within 12 hours.