Top 10 Biggest Submarines in the World Most of the world's biggest submarines are Russian. Submarines are expensive. During the Cold War, the United States invested heavily in submarine technology to counter a much larger Soviet submarine force. Technological superiority proved a winning but expensive strategy. How expensive is hard to say. Determining the cost of any advanced military technological system produced in relatively small numbers raises complex problems. There are no price lists for

This 'AIRCRAFT' Is Also a SUBMARINE! (Convair Submersible Seaplane!) | Trailmakers