As I mentioned in a thread earlier this spring, my bet is that the Queen's Chamber shafts each continue for 9.2 meters beyond the downslope face of the first "door", meaning that the shafts continue for about 9 meters beyond the downslope face of the second "door". This prediction follows from the gemetrical construction which I have proposed to be the design basis for the Khufu pyramid's interior layout. (See www.atara.net/pyramids/khufu/)
This theory also addresses the concerns raised by Anthony that a tenable theory for the shafts should explain "why the second chamber’s shafts were sealed at both ends", and "why both pairs of shafts exit at approximately the same heights. Directionality of the shafts must also be explained". I believe that one must bear in mind that the pyramids were designed to incorporate (satisfy?) a number of design imperatives simultaneously. Issues of design objectives were resolved, I believe, from a point of view of seeking to achieve a "complementary" result where two (or more) ends could be met - when so desired - via one design choice.
Anyway, a strong test of any theory is whether it can predict the finding of something not yet known. My prediction is that the Queen's shafts continue for about another 9 meters past the second door, and then stop.
Best,
Lee Cooper