Japan and the United States will jointly develop a fuel-cell powered submarine that can run for a month under the sea on a single charge, a report said on Friday.
The top-selling Yomiuri Shimbun reported that the unmanned, 10-metre (33-feet) long sub would be able to chart a pre-programmed course before returning to base.
The story, citing unnamed Japanese defence ministry officials, comes as Tokyo and Washington look to beef up their security alliance as they warily eye an increasingly assertive China.
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