What is the scale of this scene? How tall is that wall? I just finished reading Arthur C. Clarke's 2061 about people landing on Halley's Comet, so this video i

What is the scale of this scene? How tall is that wall? I just finished reading Arthur C. Clarke's 2061 about people landing on Halley's Comet, so this video is a timely illustration of what they might have seen. :)