Along with the usual flying drones, there are also models that can move along the surface of the water like boats, that can explore underwater like submarines, or that can even both fly and float. As is the case with its feathered namesake, however, Oakland University’s Loon Copter can fly, land on the water to see what’s under the surface, and then dive down to check out what it sees.

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The Loon flies in the same fashion as any other quadcopter, and initially floats when it comes to rest on the water. It can then simply sit in one spot, or it can use its props to push itself along the surface. The real fun starts when it pumps water into its buoyancy chamber, though, causing it to sink.

Instead of submerg...