► Subscribe for more || ► Watch the GWR’s Favourites || ► Friedi Kuhne || The highest crossing of a slackline over an urban area, under International Slackline Association (ISA) rules, is 350 m (1,148 ft) and was achieved by Alexander Gribanov, Maxim Kagin, Vladimir Murzaev, Gennady Skripko (all Russia), Mia Noblet (Canada), Friedi Kuhne (Germany) and Nathan Pauling (France), who walked between the OKO Tower and N
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