If you’re afraid of heights, you might want to check out now.

Russian daredevil duo Vitaliy Raskalov and Vadim Makhorov — aka ‘On the Roofs’ — became internet sensations when they climbed to the top of the Shanghai Tower a few months back, but they’ve taken it to another level this time.

In their latest clip, they climb up to the rooftop of the China Online Centre skyscraper in Hong Kong, access the massive billboard screen on top of the building, and hack it to say ‘Whats Up Hong Kong?’ They then used the billboard to display video of their infamous Shanghai climb.

The new clip was filmed with multiple GoPro cameras and a small drone that circled the building. While it looks like a set-up to us, Mashable has spoken to the climbers and confirmed that the video is authentic — and that the building and the billboard were accessed without the owners’ permission.

We’ll maintain a healthy skepticism on that front, but either way, it’s an incredible video, isn’t it?