Underwater robots face many challenges ... True, it’s no speed demon compared to a propeller, but it doesn’t disturb marine life or environments as it moves around. This method of movement ...

An eyewitness who saw the horror crash told the New York Post how the chopper went underwater within ‘seconds ... and then the tail whipped off, and the propeller fell while it was falling.” ...

Its creators claim it can carry out underwater inspections without endangering humans or wildlife, as propeller-driven robots would. Flagella are tiny, hair-like protrusions found on many bacteria ...