Five years ago two new submarines bought from the Netherlands joined the fleet, and became the Hailung and Haihu after design improvements were made.
五年前再向荷蘭採購了「海龍」、「海虎」兩艘新潛艇，加入服役行列。由荷蘭潛艇改良設計而成的「海龍」、「海虎」，艦身造型像一滴眼淚，在海中航行時可將阻力減至最小。