Yorda:
You appear to read too much of the extensive pseudo-science literature without a critical eye.
One theory regarding the Ark of the Covenant is that due to its construction [gold metal plating, insulating wood, gold metal-plating] it might have acted as a capacitor while being walked through deserts sands, building up a charge. Upon discharge when someone touched it, persons might have received a large shock, possibly even large enough to stop their heart, killing them.
From such incidents, it is easy to see how stories could become embellished over time, leading to fanciful descriptions later recorded in the Bible.
There is ZERO evidence that the Great Pyramid, or other pyramids, were used as a repository for the Ark of the Covenant. The Great Pyramid was sealed upon completion of its construction, and there is no evidence that it was used as a tomb, though there is extensive evidence that many of the prior and subsequent pyramids were used as tombs. According to some early Greek writers, there was a hidden entrance to the Great Pyramid, a hinged limestone block that covered the entrance, but by the time of Al Mamoun there was no evidence of such secret door, so he tunnelled into it with brute man-power, guessing there might be a hidden entrance [of which there were stories of hidden entrances back then] in the same general vicinity [north face, down low] as were the entrances to the other pyramids that had been broken into.
By good luck, Al Mamoun only had to tunnel some 30 meters before coming upon the actual hidden entrance's descending tunnel. The interior ascending passage had been hidden with a covering over it to hide it, so that anyone entering the pyramid [after discovering the exterior hidden entrance] would go down the descending tunnel and find the empty subterranean chamber, and leave, never guess there was also an ascending passage. However, Al Mamoun also discovered the ascending passage, because the covering had dropped free, falling to the floor of the descending passage, during their tunnelling. It was that "thunk" sound that directed their tunnelling efforts towards the descending passage.
It is a mystery as to why the upper chambers were empty, save for the solid granite "sarcophagus", which is also mysteriously reported to have a volume capacity the same as that of the Ark of the Covenant.
Other mysteries still surround the Great Pyramid. It's geometery is possibly related to the geometery of Stonehenge, though that's another investigation that is currently ongoing.
Personally, I believe there is much left to discover about the pyramids, in particular the Great Pyramid. Are there un-discovered ascending passages in the others? Have they been properly sought for? What was the purpose of the "air-shafts" in the "queens chamber" of the Great Pyramid, since they did not communicate with that chamber until the covering was broken open in the 1800s A.D., and since they do not go all the way to the exterior of the pyramid?