Comment by avar

This diagram shows a shaft going into this void from two sides. I was wondering why they don't send a robot down into those.

Seems the answer is that they have, but there's something blocking the shaft and they're not willing to destroy it any further for some reason:

http://guardians.net/hawass/articles/news_on_the_robot_Dec_2...

http://www.crystalinks.com/gantenbrink.html

http://www.gizapower.com/Articles/door2.html