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In page Fuel cell:
"The Type 212 submarines of the German and Italian navies use fuel cells to remain submerged for weeks without the need to surface.[citation needed] The U212A is a non-nuclear submarine developed by German naval shipyard Howaldtswerke Deutsche Werft.[7] The system consists of nine PEM fuel cells, providing between 30 kW and 50 kW each. The ship is silent, giving it an advantage in the detection of other submarines.[8]
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