NEWPORT, R.I. — Just beneath the placid, sailboat-dotted surface of Narragansett Bay, torpedo-shaped vehicles spin and pivot to their own rhythm, carrying out missions programmed by their U.S. Navy masters. The bay known … They are typically powered by batteries, but their endurance has been sharply limited by the lack of a stronger power source that will allow for safe handling by sailors who deploy and collect the devices aboard submarines. With advances in … …

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