A look inside the Panama CanalMay 8, 2014
Under the locks there are service tunnels and machinery rooms for all of the moving parts that make things happen. This tunnel is about a mile long and provides access to the machinery that operates the giant valves that let water in and out of the locks.
Voyagers John Lewis and Shawn Maxey on the Tayana 37 Pilothouse cutter Active Transport have been through the Panama Canal three times. They went through twice as line handlers on other voyager's boats and once aboard Active Transport. On one of their Panama Canal transits they went on a VIP tour inside the workings of the canal at the Miraflores Locks. John then posted a series of photos from the tour on their blog. Not only are these photos a view of the canal most people don't ordinarily see, John has done a marvelous job writing information-heavy captions to accompany them. You can view the image gallery here.
Below is a shot of Active Transport on its traverse of the canal.