Cartesian Diver (2B40.30)
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A Cartesian diver is controlled by squeezing a bulb attached to the water column. Increased pressure decreases the air volume in the diver and lowers its buoyancy so it sinks. Release the pressure and the diver returns to the top.
1) M. E. Loverude; A research-based interactive lecture demonstration on sinking and floating. American Journal of Physics. 1.October.2009; 77 (10): 897-901. [PDF]