A photo taken at 100 meters depth (333 feet). We are in the middle of the twilight zone. The sun forms a halo of light blue. Only a tiny percentage of its light reaches us at this depth. Elsewhere, it is darkness that reigns. We can distinguish the ark and the two huge mountains that support it. The arch is at a depth of 80 meters. The feet of the massifs is a little over 90 meters deep. I wonder how this training could have occurred?