In Saudia Arabia unique pictures from 7000 years old underground tunnels have been discovered. In Saudia Arabia there is a old system of tunnels which is known as Umm Jirsan and it is believed that this system is almost 3 million years old. Recently Archeologists has discovered bones of old animals between 400 to 4000 years, and human remains from 150 to 6000 years old are also discovered from these tunnels.
Research team have been working on Umm Jirsan and relative tunnels from last 15 years and now they have found that these tunnels were occupied by Shepherds living in Arabian Peninsula at the beginning of old age. Those people were living with their refugees and cattle and they left various pictures on walls and items on the rock while leaving. This discovery is important for scientist and archeologists for learning more about the climate, human living, and many more about ancient civilizations.