Battle of the Atlantic links
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- Battle of the Atlantic from the WW2Timeline and July 1941 Threshhold and Undeclared Naval War 1941
- Battle of the Atlantic Images
- Battle of the Atlantic from National Museums Liverpool
- Battle of the Atlantic from Hyperwar
- Merchant Marine in World War II from U.S. Maritime Service Veterans
- Ships: SS Iroquois 1939 and SS Robin Moor 1941
- Squalus submarine and images
- Submarine Technology from CNO
- The U-boat Net from Gudmundur Helgason
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