求一篇电影Down Periscope(中译名潜艇总动员)的英文影评
This movie is practically McHale's Navy for the 90s or Police Academy at sea. Grammer proves he can play roles other than Frasier as he outwits and outfoxes the Navy in order to get his own sub. Rob Schneider is as wormy as usual, the same in every role he plays, and Lauren Holly is the local sexpot albeit with a brain. Ken Hudson Campbell is as funny as usual with almost every line a catch phrase. The movie has a wonderful intelligent plot and a non-predictable script that still surprises me every time I watch it. Many of the Navy phrases and terms go over my head, though, but it's a small obstacle for the sheer accuracy and realism of the movie and its characters.
电影《潜艇总动员》（Down Periscope）中那艘潜艇穿过一艘油轮的螺旋桨，钻到了油轮的底下，这可能吗？
在声纳发明前这是不可能的，只能依靠初始航向、航速、潜艇所在深度的盐度、温度及潮汐、洋流的方向、流速，人工推算潜艇移动的距离和方向，潜行时间长了一定有误差，就不可能跟踪隐蔽在油轮的底下。
但是当高精度激光陀螺惯性导航仪和声纳发明后，通过电子惯性导航和声纳回波探测定位，就可以进行精确移动跟踪和定位水面物体，实现影片中的场景。这也是二战后的一种常用潜艇战术，只不过《潜艇总动员》中的情节过于无厘头夸张了，和真实的潜艇战术还是有很大差距的。
