Why are people using infrared to look for new chambers and passages? Muon detectors, using cosmic rays for the source, were used in the 1960s to conclude:<p>&gt; We can say with confidence that no chambers with volumes similar to the four known chambers in Cheops&#x27;s and Sneferu&#x27;s pyramids exist in the mass of limestone investigated by cosmic-ray absorption. The volume of the pyramid probed in this manner is defined by a vertically oriented cone, of half-angle 35 degrees, with its point resting in the Belzoni Chamber. The explored volume is 19 percent of the pyramid&#x27;s volume. We hope that with minor modifications to the apparatus the complete mass of limestone can be searched for chambers. - <a href="http:&#x2F;&#x2F;www2.lns.mit.edu&#x2F;fisherp&#x2F;AlvarezPyramids.pdf" rel="nofollow">http:&#x2F;&#x2F;www2.lns.mit.edu&#x2F;fisherp&#x2F;AlvarezPyramids.pdf</a><p>That&#x27;s one of the reasons we know for certainty there is no large, unknown grain storage chamber in those pyramids.