Deepest underground balloon flight

According to Official Guinness Records,

The deepest underground balloon flight is 206 m (675.85 ft) and was achieved by Ivan Trifonov (Austria) in Mamet Cave, Obrovac, Croatia on 18 September 2014. Ivan is a ballooning veteran who also holds two more Guinness World Records titles: First balloon flight over the North Pole, and First balloon flight over the South Pole.

For a complete list of 2014 records, please visit 2014 Guinness Records in Croatia.

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