Daily Star's biggest headlines straight to your inbox!Russian attack submarines carrying hypersonic missiles have reportedly been running “deep penetration” missions in the Norwegian Sea between the Shetland Islands and Iceland.The practical limit for most modern attack subs is around 1300 feet, but the Borei-class nuclear powered subs are thought to have been diving far deeper in a bid to enter the North Atlantic undetected.Technically, the craft could reach depths approaching 3,000 feet, but that limit is rarely approached in peacetime.Defence analysts say the Borei subs are believed to be capable of carrying Russia’s “truly unparalleled” Zircon 3M22 hypersonic missile, which travels at speeds of over 6,000mph.The new breed of hypersonic.
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