Moscow residents watched with bated breath, as a group of adrenaline junkies attempted a tightrope walk between two of the city's tallest towers, all without wearing harnesses.
Sky walk masters from Russia, France, Germany and Canada took part in the ambitious 245-metre walk, at an altitude of 350 metres.
The daring feat marked the founding of Moscow city 872 years ago.
The group broke the previous world record by around 100 metres, however representatives of Guinness World Records said they need to do measurements before officially registering the record.
The current record for walking to highest and longest urban highline is held by Alexander Schulz , who walked 217 metres between Torre BBVA Bancomer and Torre Reforma in Mexico City, Mexico at a height of 247 metres.