推荐回答（3个）
目前现役的应该是美国的海狼及攻击核潜艇以及其改进型号。
攻击型核潜艇专门用于攻击，个体也较小，因而其静音效果要比同等技术条件下的战略核潜艇要好……而核动力潜艇的静音效果要比常规动力潜艇的效果要好，是肯定的……价格和技术水准都不是一个层次上的。
是俄罗斯的
基洛级别潜艇，号称海洋里面的黑洞
你想想
不过，现在俄罗斯有 北风之神 级别潜艇出来了
朋友，希望我的回答能让你满意
O(∩_∩)O谢谢
潜艇的隐蔽性是由潜艇自身的安静程度决定的，安静程度主要取决于潜艇噪声的大小。海战潜艇的噪声低不仅能保持行动的隐蔽，避免被敌声呐发现，且可增大自己声呐的探测距离，作到先敌发现，保持作战的主动权 。按照国际公认的算式，潜艇水下噪音每减小6分贝就可使敌潜艇被动声纳的探测距离缩小一半，一旦潜艇自身噪音降到90分贝，那么海洋背景噪音就可以完全掩盖潜艇行踪。
目前世界上最静音的潜艇是美国海浪级核潜艇（共在役三艘）。“海狼”级的第一使命是反潜，降低噪声对它来说至关重要。该级艇的降噪措施主要有：核动力装置采用自然循环反应堆以降低一回路噪声；采用蒸汽轮机电力推进方式，取消噪声大的减速齿轮箱；首次使用新型的“泵喷射推进器”，彻底消除了螺旋桨噪声；艇体外表敷设一层阻尼吸声橡胶（消音瓦），使艇体表面形成一个良好的无回声层；艇体外形光滑，开囗少，突出物少；艇上所有运动机械都经过降噪设计，并且都安装在高效减振基座、弹性支座和弹性减振器上；为降低舱室内部噪声，在美国潜艇上首次使用了“有源消声技术”，也就是在噪声处发出与噪声振幅相同但相位相反的音响，来抵消该处原有噪声，实践证明效果明显。在综合运用了以上措施后，“海狼”级的噪声达到了 90-100分贝，这一量级已经低于海洋背景噪声，这使它成为一级真正的“安静型”潜艇。
而所谓的“基洛”级潜艇 是“当今世界上最安静的潜艇”多半是西方国家（含俄罗斯）吹出来的。“基洛”级潜艇通过一些列措施（采用光滑水滴形线型艇体、外表短粗，是经过精密计算的最佳降噪形态。其推进器改用7叶大侧斜桨，转速降到250转/ 分；柴油发动机被安置在软垫上运转；并且对全艇所有产生噪音的设备实行封闭管理；潜艇外壳还嵌满了塑胶消音瓦，不但能吸收本艇噪音，还可以衰减对方主动声呐的声波反射）其噪音降到了118分贝，也因此获得了“大洋黑洞”的称号。可见这个“大洋黑洞”（118分贝）与“海狼”级（90-100分贝）相比连个渣儿都不算。
随着科技的发展，现在的潜艇体积越大，它内部的减噪、消音设备就越多，也就越安静。所以现在的第四代核潜艇和三代改进型核潜艇都比常规潜艇安静（以前恰好相反）。
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