The top lock of the three had just begun to drain into the middle lock. The boat ahead was leaving the locks on Gatun Lake.

Adjacent to the top lock of the Panama Canal Gatun Locks were more utility buildings.

Here was one of the eight mules holding the ship centered as it moved from the middle lock into the third and highest lock of the three.

A pair of stairways provided access to tunnels under the mule tracks.

Other ships were waiting on Gatun Lake for a turn to travel down the locks to the Caribbean Sea.

One of the Panama Canal Workers was talking on a phone next to the top lock.

The last maintenance area ended at a fence beyond which was Gatun Lake.

The Pilot Boat approached to remove the pilot needed for transit of the Gatun Locks. The other two pilots remained on board.

The last of the Gatun Locks mules had just passed a switch that, when reversed, would take it back on the outer return track.