Here is the table top of the main controls of the Miraflores Locks. When the little silver knobs are turned, they will open a set of gates or let water in or out of a chamber. The red colored device in the immediate front is a locking device so no one touches these knobs. There are vertical meters that show the depth of the water in the chamber. What a neat set up. We both got to turn one of the knobs during this transit. Under close supervision of course.