The Bermuda Triangle
Turn the crank and watch the object floating in the liquid.
How it works
Initially, the object floats because its average density is lower than the density of the liquid. By turning the crank, you produce air bubbles which reduce the average density of the liquid. When it becomes less dense than the object, it sinks.
According to one hypothesis concerning the Bermuda Triangle – an area in the Atlantic Ocean near Bermuda where many ships and aircraft have mysteriously disappeared, eruptions of methane from underwater deposits are responsible for the accidents. Methane escaping to the surface in the form of bubbles could make the ships lose their buoyancy and sink.