In Chapter 4 of the article titled "Evidence of Ancient High Technology - Liquid Polishing at the Serapeum of Saqqara," the author discusses the intriguing evidence of advanced technology used by ancient civilizations. The focus is on the Serapeum of Saqqara, an underground chamber in Egypt where massive stone sarcophagi containing the remains of sacred bulls were found.

The article highlights the astounding precision and sophistication of the stone work in the Serapeum. The sarcophagi weigh several tons each and are made from incredibly hard and durable diorite stone. What captures the attention of experts is the perfect flatness and smoothness of the surfaces, as if they had been polished using powerful modern machinery.

The author presents various theories about how the ancient Egyptians might have accomplished such remarkable precision. One hypothesis suggests the use of liquid polishing techniques, similar to those used in modern metalworking. This idea is supported by the discovery of unusual marks on the stone surfaces, resembling those left by abrasive liquids.

The article also discusses the possibility of laser technology being employed in this ancient construction. Some experts speculate that the Egyptians might have used a form of early laser technology to achieve such precision. However, this theory is met with skepticism, as there is no concrete evidence to support it.

In conclusion, the author presents the Serapeum of Saqqara as a fascinating case of ancient high technology. While the exact methods used by the ancient Egyptians remain a mystery, the extraordinary precision and quality of the stone work are undeniable evidence of advanced craftsmanship. The article invites readers to contemplate the possibility of lost or forgotten technological knowledge from ancient civilizations.