I was looking at airports in Saudi Arabia and noticed a strange one. At Taif Regional Airport near Mecca there are a bunch of taxiways all seemingly randomly intersecting at different angles, each with a bulge in their width and a structure built in the middle of the bulge. Based on the shadows, they seem to be sunken by some amount with the structure built to roughly the same height that the taxiway is sunk. I counted at least 30 of these structures. The measuring tool on Google maps shows them to all be around 135 feet wide, and of various lengths.
I couldn't find any information about these structures or their purpose. Are they hangars of some sort? If so, why the strange design?