Moving into the middle chamber of the Gatun locks, Panama Canal

The upper chamber of the Gatun lock has dropped to the filled level of the middle chamber. With the water level between the two chambers the same, the pressure is equalized on the gates and they can be opened to let the transiting vessels enter the next chamber. Although the car carrier (in the background) is huge, much less of it is visible above the chamber walls. Just as the line handlers adjust the tension on the mooring ropes during water level changes in the chambers, so to do the locomotives that keep the ships centered and hopefully not scraping on the sides of the locks - a phenomena known as "Panama Canal rash."

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