Vietnam has ordered six Kilo-class submarines from Russia.

越南已经从俄罗斯订购了六只基洛级潜艇。

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Mesoproterozoic plan with 022-class submarines will be used speedboats.

计划中元级潜艇将会配合022快艇使用。

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Similar problems also were found on at least three other Virginia-class submarines.

类似的问题至少在另外3艘弗吉尼亚级潜艇上也被发现过。

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Audacious is the fourth of the seven Astute Class submarines being built for the Royal Navy.

BBC: HMS Audacious: MoD announces ?1.2bn submarine contract

Mr Cameron visited HMS Victorious, one of the Royal Navy's Vanguard-class submarines, which is returning from its 100th patrol.

BBC: David Cameron praises Scottish defence industry

If the go-ahead is given any of the Royal Navy's 15 Trafalgar-class or Swiftsure-class submarines could visit Southampton - as well as foreign submarines carrying nuclear weapons.

BBC: Plan for nuclear submarine return