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水下战力是美国与中俄的军事角力重要环节，美国海军周一破纪录发出222亿美元(约928亿令吉)的合约，以建造9艘新一代维珍尼亚级核动力攻击潜艇。

它们的特点是火力及性能比同级现役潜艇强大，搭载的战斧巡航导弹数量由12枚激增至40枚。

维珍尼亚级潜艇是美军主力攻击潜艇，除了执行反潜、反舰及对地攻击的传统任务，也可以执行收集情报及侦察等特战任务。

今次建造的维珍尼亚级属最新的Block V型，特别之处是配备维珍尼亚筹载模组，额外搭载多28枚战斧巡航导弹，对地攻击火力升级。

该批潜艇预料2025年至2029年交付，并取替上一代的洛杉矶级核动力攻击潜艇。

美军现时有18艘维珍尼亚级服役，另有10艘则正在建造。

美军在声明表示，潜艇部队是战力基础，令军方在国家安全取得优势，在威慑方面无人能及。

中国及俄罗斯近年积极发展海军力量，特别是潜艇方面，而美方估计中国明年前将拥有最多70艘潜艇。