In an earlier posting made here, and in a letter I have sent to Zahi Hawass at the SCA address, I have expressed my hope that the new robotic exploration of the Queen's Chamber shafts will have the capability to send a fiber optic probe, or some such device, a distance of about 9.2 meters from the front surface of the first "door" in each shaft (i.e., from the "Gantenbrink door").
As I detail elsewhere (http://atara.net/pyramids/khufu/computations/), the diagram which I believe lies at the heart of much of the design of the interior layout of the Khufu pyramid provides a rationale for the lines taken by the King's and Queen's Chamber shafts - and for the location of the first "door" in the Queen's Chamber shafts. This same diagram proceeds to also provide a similar rationale for the location of another feature in the Queen's Chamber shafts at a point which lies about 9.2 meters further along the line of each shaft from the first "door". I believe it likely, therefore, that the shafts continue for this extra 9.2 meter distance and then stop - meaning that they stop at a point that is not too far from the pyramid's current exterior.
An alternative scenario is, of course, that the shafts do not continue past their second "doors". However, if they do not, then I would still consider it possible - if not probable - that some sort of feature was designed into the pyramid at the 9.2 meter point which I describe. As I say, a very similar diagrammatic rationale predicts this 9.2 meter location as that which appears to provide the rationale for the first 'door" location.
I would view it as an extremely unfortunate missed opportunity if the planned robotic exploration did not have the extended fiber optic capability I speak of.
Lee Cooper