海上舰艇,包括潜艇和驱逐舰,经常受到多种敌人袭击。随着那些装备专用武器并能到达舰艇底部的水下破坏者的出现,现代化舰艇需要解决的一个主要问题是如何防备“水下杀手”。为此,在不同的时期采用了不同的手段。在对付“蛙人”方面,就采用过设置专用防护网,以及定期向水下投掷手 Offshore ships, including submarines and destroyers, are often attacked by many enemies. With the advent of underwater destroyers armed with specialized weapons and capable of reaching the bottom of the ships, one of the major problems to be solved by modern ships is how to guard against “underwater killers.” To this end, in different periods adopted a different means. In dealing with “frogman”, it has adopted a set of special protective net, as well as regularly throwing hands under water