The American nuclear submarine Connecticut could not rise to the surface in the Arctic due to an ice sheet. Another submarine missile carrier, Hartford (SSN 768), managed to break through the ice, but the submarine that surfaced received significant damage.
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At the same time, the thickness of the ice, judging by the photo published by Navy Currents Magazine, did not exceed 40 centimeters.
Russian submarines – for example, the submarine Akula and Antey – can break ice up to 2.5 meters in thickness.