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I din't finish typing!
The bottom gates are open. They must be closed and the paddles must be down. You then open the paddles in the top gates to allow the chamber to fill. Then you close the paddles in the top gates, open them, bring your boat into the chamber. Open the paddles in the bottom gates to allow the water out of the chamber.Once the level in the chamber has dropped to match the level of the water outside the bottom gates, you can then open the bottom gates and go on your way, leaving the bottom gates open.