Even when he found the opening, he was not much nearer the burial chamber. An underground passage was driven for over 350 feet through the solid rock at an angle below the foundations of the Pyramid, until it opened out in a chamber immediately beneath the point of the Pyramid. The chamber is really a fine hall about 46 feet long by 27 feet wide, with a roof 11½ feet above the level of the floor. On the other side of the chamber the underground passage continues for over 50 feet, but we are quite at a loss to divine the reason for this extension. Maybe the engineers drove this gallery with the definite intention of misleading any one who should eventually break a way into this underground retreat. At any rate, it is, like the rest of the passage, driven through the solid rock, and finishes up against the rock wall. No other outlet from this passage has ever been discovered, so its object is a mystery. Perhaps the engineers’ plans were altered, or perhaps it was designed to baffle thieves, and compel them to waste time by searching for an opening where none exists. Khufu did not underrate the skill of the plunderers of the tombs. He realized to the full their patience and cleverness, and did all in his power to outwit them. The passage is lined throughout with blocks of stone, and we can imagine the robbers searching anxiously up and down the dark passage, casting back and fore, tapping the stones to try to find the outlet leading to the King’s Chamber. All the blocks look exactly alike, and they may have sought for months before they found that block in the roof which pivoted in a similar manner to the stone covering the entrance. This passage branched upward to the Queen’s Chamber, and opened out to the Grand Gallery, which is very narrow and high, at the end of which comes another passage leading to the Chamber of King Khufu. Before the robbers were able to reach these chambers, they had many difficulties to surmount and problems to solve. At various intervals the passage was sealed by four mighty blocks of very hard granite. These blocks must have been supported until after the funeral ceremonies were completed; then the priests withdrew, the supports were knocked away, and the blocks crashed down into position in the deep grooves that were cut for them in the passage.