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With the outer and inner doors open, the box is now ready to receive a boat.
Click on the arrow to see the boat enter the box.

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As the boat enters, it displaces exactly its own weight of water, so the buoyancy of the box does not change.
Click on the arrow to continue to see the boat entering the box.

EXIT

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With the boat in the box, the doors must be closed and the box floated free.
To see in detail how this is done, click on DETAIL
To continue with lowering the boat, click on LOWER