This looks like one of those headcrabs from Half-Life, albeit it being a mechanized one. Known as the Crabster, this is a robotic wonder which has the ability to revolutionize underwater exploration, thanks to the Korea Institute of Ocean Science and Technology that will test the robot in the Yellow Sea as the Crabster assists archaeologists in shipwreck site exploration.
Crabster Robot Could Change The Way We Explore Underwater Sites original content from Ubergizmo. 
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One problem with conventional ROVs is that while their propellers are plenty strong enough to kick up columns of silt from the sea floor, they typically lack the power to effectively navigate in strong currents, which limits where and how well they can survey a given area. But this new underwater explorer sidesteps both of these problems by skittering around the sea floor like a crab.
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