Well, there’s this 1700 foot climb shot in HD, where the guy is at least tethering himself at every rung.
And then there’s this 360p footage of a technician free-climbing a 1786 foot mast which is utterly bloody terrifying. From the point where he exits the steel framework onto the outer rungs to the end of the video, my testicles are doing their best to retract into my abdomen. At the very top, he stands on a plate about 18 inches square and LETS GO WITH BOTH HANDS TO TETHER HIMSELF. AAUGH!!!
Edited to add: that moment where the commentator says, apparently with complete lack of irony, that “If a storm’s blowing through, there’s no quick way down”.