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Ivan Trifonov has just added a fifth Guinness World Record to his collection after reportedly becoming the first person to complete an underground hot air balloon ride.
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.
- Ivan Trifonov
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