Remote-control buoyancy control device?

Anyone know of any commerically available buoyancy control products that you can control from a distance (unmanned)? I am hoping for device that is relatively small, and can fit into a cylindrical tube, and can control the buoyancy of the tube. Any help would be appreciated, thank you

Answer:
You could use a simple motor conrolled by remote to operate a small pump. Then create a balist system in the tube to add and remove water as needed.

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