In a nicely Pharaonic touch, one of the six ducts going 
  into the ground here is the sole property of President 
  Hosni Mubarak, or (presumably) whoever succeeds him as 
  head of state. It is hard to envision why a head of state 
  would want or need his own private tube full of air running 
  underneath the Sahara. The obvious guess is that the duct 
  might be used to create a secure communications system, 
  independent of the civilian and military systems (the 
  Egyptian military will own one of the six ducts, and ARENTO 
  will own three). This, in and of itself, says something 
  about the relationship between the military and the 
  government in Egypt.

http://www.wired.com/wired/archive/4.12/ffglass_pr.html

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