We've seen amphibious robots before, like this snake whose slithering motion could propel it across land and through the water, but this one, developed by the Biorobotics Laboratory of École Polytechnique Fédérale de Lausanne(EPFL) in Switzerland, is possibly the first that is capable of three separate locomotive processes: walking, crawling and swimming.
Gizmag reports, "To do this, the group had to essentially build a mock-up of a salamander's vertebrae and limbs that could alter its stance depending on whether it was traversing in water or not. Walking is simply handled by rotating the limbs, but reproducing the wave-like swimming motions requires a system of coupled nonlinear oscillators. A human controller can then use a laptop to wirelessly issue commands to an on-board microcontroller to change its motion, speed, and direction. The result is the first robot that's equally capable of swimming like a fish, crawling like a snake, and walking like a lizard."
Another cool aspect of this robot is its modularity. Each module contains its own microcontroller, battery and motors so that it can be split into different parts and still work, which would be especially useful in search and rescue operations where it may have to navigate difficult obstacles. If part of the robot gets damaged or lost, the rest can continue on.
You can watch this video of the Salamander II in action.