来自MSN4 天
Submarine Warfare: What Were the U-boats?
By 1914 the submarine was not a new weapon, having first been used 150 years earlier. By the start of WW1 all the major ...
Yahoo News20 天
U.S. Navy announces four new nuclear submarines and their sponsors
Jan. 14 (UPI) --The U.S. Navy is building four new nuclear submarines to supplement its aging fleet. "Today's submarine force is the most capable force in the world and in the history of the U.S. Navy ...