The video clip of self walking ladder was a false alarm.
i have done some research googling the youtube videos by searching “walking ladder” and i have arrived at following verdict!
Firstly, it’s not taken at Changi Airport and not at Terminal 4’s construction site. The original video was filmed somewhere else and uploaded to YouTube, and another channel claims it was filmed in Indonesia.
In fact, it had gone viral on Reddit last year on the thread r/videos, with the source for the video coming from yet another site.
Secondly, the phenomenon is debunked scientifically. Please watch the video to understand.
Thanks for watching
Video credit to the YouTube channel owner