The Swiss tightrope expert has already inched his way up or down four mountains in Germany, Austria and Switzerland this week.
His aim is to set seven records in seven days by going higher or further than anyone dared go before.
On Thursday, the 46-year-old was saddling up near Bern, the Swiss capital, in a bid to cycle across a wire strung between two cranes 50 meters (164 feet) above the ground.
Nock, who never uses a safety harness during his stunts, is donating proceeds from his weeklong daredevil tour to charity.