How were the blocks transported and raised to a height of 145 meters? Although it is not known for certain how the blocks were put in place, several theories have been proposed. One theory suggests that the Egyptians constructed a straight or spiral ramp that was raised as the work proceeded. This ramp, covered with mud and water, facilitated the movement of the blocks, which were pushed (or pulled ) into place.Experts estimate that as many as 100,000 slaves were needed to build the pyramid, which was erected over a period of approximately 20 year.To this day, many questions remain unanswered. For example, in the 1920s, a Frenchman named Antone Bovis made a surprising discovery. In spite of the heat and the humidity inside the pyramid, the dead body of an animal left in the main chamber did not decay, but instead completely dehydrated. Bovis constructed small-scale model of the pyramid and placed the body of a dead cat inside. It did not decay.