In the past few months, we have covered the ANYmal robot taking on a wide variety of tasks. ANYmal C is made for challenging environments. It has a wide variety of sensors and completely waterproof body. It uses 3D lasers to scan its environment. It has a max speed of 1 m/s and can overcome slopes up to 20 degrees.
As you can see in the above video, this robot can operate safely in a shallow body of water. It comes with satellite based navigation for outdoor environments (optional). More info is available here.