Type U 151 submarine
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Type U 151 U-boats were a class of large, long-range submarines initially constructed during World War I to be merchant submarines and later used by the Kaiserliche Marine.
U-155, a Type U 151 U-boat exhibited in London after the First World War.
Cruiser submarine
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A cruiser submarine was a very large submarine designed to remain at sea for extended periods in areas distant from base facilities. Their role was analogous to surface cruisers; cruising distant wate
Type U 151 submarine
…range of around 25,000 nautical miles (46,000 km; 29,000 mi). The success of the Type U 151 submarines led to "Project 46", the larger Type U 139 "U-cruisers", designed from the outset as military submarines. Deutschland made two successful commercial voyages before being commissioned into the Kaiserliche…
Surcouf had the largest guns of any cruiser submarine.