人类进入20世纪后,随着科学技术的发展及海战的实际需要,潜艇应运而生。它的出现,很快成为一种新型兵力活跃在战争舞台上,使海战成为空中、水上、水下的立体战。历史证明,潜艇在海战中起的作用是巨大的。它在两次世界大战中各击沉5000余艘运输船,使海上交通线几近瘫痪,迫使交战双方不得不投入大量的人力、 After mankind entered the 20th century, with the development of science and technology and the actual needs of naval battle, submarines came into being. Its emergence soon became a new type of force active in the arena of war, making naval warfare a three-dimensional warfare of the air, water and water. History has shown that submarines play a huge role in naval battles. It has sunk more than 5,000 shipping vessels each during the two world wars, paralyzing the maritime traffic lines and forcing the warring parties to have to devote a great deal of manpower,