http://mmbiz.qpic.cn/mmbiz/kFc7ibuFBHl8znBA1oNnfLaFaqBzVZPVA2AInky045cy7vib0R4IcJaHgED0vJko4ZFIbnOmKhic6yibTfhtRKjP3A/640?tp=webp

【科普知识】海中断崖：如果海水跃层是上层密度大，下层密度小的状态，形成负密度梯度跃变层，海水浮力由上至下急剧减小，被称为“海中断崖”。潜艇在水下航行中，如突遭海中断崖，会立即失去浮力，急剧掉向海底，大多数常规潜艇的有效潜深为300米，潜艇不受控制的掉到安全潜深以下时，会被巨大的海水压力破坏，造成海中断崖失事，二战以来各国海军出现过数次海中断崖的失事。

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【历史事件】1963年4月10日，堪称美国海军当时王牌武器的“长尾鲨”号核潜艇，在试潜过程中突发险情，7分钟后，“长尾鲨”号与海面上的舰艇永远失去了联系。它是世界上第一艘沉没海底的核潜艇。

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【水下利剑】潜艇是机动灵活、行动上极其隐蔽的水下利剑，长期以来很少出现在公众视线之中。但同样是因为它的隐蔽性强，任何微小的差错，都会给航行在幽暗海底的潜艇带来无法预料的灾难。

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【危急万分】根据潜艇设备显示，潜艇所在海域深度达到了3000多米，如果不能停止下沉，艇毁人亡的惨剧将不可避免。

http://mmbiz.qpic.cn/mmbiz/kFc7ibuFBHl8znBA1oNnfLaFaqBzVZPVAXwI1sMYKGBhKnTqjjMwpVwAjsKxT90sLkQYQ2jfsmo39oviajl6H8iaQ/640?tp=webp

【险情频发】主电机舱进水，全艇官兵已面临绝境。生死一刻指挥员将怎样沉着应对？今晚20:00央视七套《军事纪实》一起看幽暗的深海之中，官兵如何与死神搏斗！

http://mmbiz.qpic.cn/mmbiz/kFc7ibuFBHl8znBA1oNnfLaFaqBzVZPVA2uMsgfb5iamHpLEPTt8icIxUnSIc1OiadzOOE9Mrwkiag3L6zj9UKCsfwg/640?tp=webp