At least 64 granite megaliths ranging from 6 to 7 meters long, 1 to 1.74 meters wide, with heights going up to 2.5 meters, and weighing from 30 to 72 tons were piled up to seal the upper chamber.

All these blocks were transported edgewise by river from the Aswan quarry to the feet of the pyramid, giving a maximum draught of 3 meters to the small dinghy carrying them.

This small dinghy was made on the base of a frame equipped with floats tied up with ropes, so the edgewise block can be entirely immersed. This construction was designed in such a way that its center of thrust was slightly above the gravity center of the block laid edgewise to allow it to float in a stable manner.

The dinghy passed through the 3- to 4-meter-deep loading basin.

The block was then placed above the roller skids that had been placed beforehand at the bottom of the basin.

Then, the basin was drained, and as the water level went down, the megalith slowly settled on the roller skids.

Once the megalith rested on the roller skids, the workers dismantled the floats. The megalith was ready for the next step.

Now, the megalith could start its journey to the pyramid’s base.