In yesterday’s post, we saw how a push boat shoves the whole 3 by 6 barge flotilla into the lock. At this point, the front and back halves have been split and the push boat has (counterintuitively) pulled back the rear half. The lock’s huge gates begin to close on the front. If you can zoom in enough, you might see a tiny worker in a yellow coat on the right and compare it to the massive pistons pushing the gate in. When they are fully closed, the outer gates will open, dropping the water level of the barges.
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