This photo is a little out of sequence as its from the Miraflores locks. It shows the curved shape of the leaves that make up the gates of the locks. The locks are double to provide some insurance against an accident that might damage one set of locks and allow Lake Gatun to drain into the ocean. An accident like that would put the canal out of commission for months wihile the water levels in the lake were allowed to build up again. The gates dont close flat. See the album on our Miraflores tour for more detail about how the gates work.
Added 6 June 2009