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Tensions between Washington and Moscow are rising with a marked increase in competition in the undersea domain, as Russia continues to invest in a fleet of specialized submarines.
Russia is the only country with a fleet of special mission subs for seabed warfare and espionage and is expanding the capability. Other countries, like the U.S., also work well in this arena and have specialist capabilities, but these capabilities reside on multi-mission platforms.
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https://news.usni.org/2021/11/30/russia-growing-secret-submarine-fleet-key-to-moscows-undersea-future