Deepest cycling underwater

According to Official Guinness Records,

The deepest cycling underwater is 66.5 m (218 ft 2.11 in) and was achieved by Vittorio Innocente (Italy) in Santa Margherita Ligure, Liguria, Italy, on 21 July 2008.
Vittorio Innocente was the previous record holder of the category and the current Farthest distance cycling underwater record holder. Lucia Sinigagliesi went to Portofino (place of the attempt) to collect the evidence personally.

For a complete list of 2008 records, please visit 2008 Guinness Records in Italy.

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