A daredevil known as "Freesolo" posted video of himself sliding down a 260-foot cable, and he's NOT wearing a harness.  The cable is attached to a transmission tower, and the slide seems to take forever.  It's almost a minute from top to bottom.

Daredevil Slides Down 260ft Pole With No Harness

ID: 1492224 This is the shocking moment that a daring freeclimber plummets to the ground via a colossal vertical wire. The climber, known only as 'freesolo' captured the intrepid footage on his action camera. Using his specially designed gloves the climber is able to descend the gigantic pole without injuring his hands.