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How to make a toy Octopus which can really swim under water

This octopus is made from plastic bottles. There is a motor and battery inside the main bottle. The motor shaft is coming out from the bottle via a lubricants chamber. This chamber blocks the water leakage to the inside of the bottle, while the motor shaft can rotate freely. It is simple to make. Have your own toy and enjoy. How to make a toy Octopus which can really swim under water
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