Casemate rooms line up one behind the other, left, in the walls of the Nahal Akrav fort. The two parallel outer walls of the fort are interrupted at intervals by transverse walls that subdivide the space into rooms called casemates, creating a formidable fortification. The casemate rooms could be used for storage or for sleeping, or they could be filled with rubble for added strength. Preserved to a height of over 6 feet, these casemate walls testify to the permanent nature of the Iron Age sites that nomads built in the desert.