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Robot jellyfish powered by hydrogen

21 March 2012 Last updated at 01:53 GMT

Engineers have invented a robotic jellyfish, powered by hydrogen.

The robot - nicknamed Robojelly - moves in water by mimicking a jellyfish's natural swimming motion.

Researchers from the University of Texas at Dallas and Virginia Tech in the US say development of the robot is in the early stages but they hope it could eventually prove useful in underwater search operations.