Following my previous video, which took a closer look at the Caliph Al-Ma’mun’s so-called forced entry into the Great Pyramid in the 9th century many will have noticed a curiosity that needs further attention, that of a likely, undiscovered vertical shaft at the junction between the descending and ascending corridors of the Great Pyramid. It all centres on what are called the Trial Passages, located just 87 metres to the east of the Great Pyramid and north of the causeway. When they were first examined by Howard Vyse and John Perring in the 1840s, they were believed to be passages from an abandoned, long-forgotten pyramid or tomb, possibly the underground passages of a fourth subsidiary pyramid of the Great Pyramid, but this certainly isn’t the case. All images are taken for educational purposes from Google Images and thehereticmagazine.com.