Dive the Holland 5 submarine

Amazon.com: Submarine Design and Construction Fundamentals: 9781763717350: Skiba, Richard: 圖書

Understanding Structure Design of a Submarine

Naval submarine visionary John Philip Holland dreamed of fighting for Irish independence from beneath the waves — here’s his amazing story

Missing Nazi submarine found in sea off Denmark

On This Day: John Holland, who designed the first submarine, is born in 1841