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Roughly 2,000 merchant ships in WWII.
Yes they do
To sink ships.
because some allied ships were carrying contraband
u-boats
because some allied ships were carrying contraband
Provided the boats and the ships displace their weight in water without the water coming inboard, they will float and not sink. A boat made of wood is likely to float even when full of water because wood tends to float. It is all to do with displacement and freeboard.
Sure ships sink. Titanic for example and hundreds of less famous boats every year. They can also disappear....it is a big ocean out there. Not all ships that go missing are found.
German U-boats were used to sink mainly merchant ships, so as to starve Britain of food supplies and ammunition.
It sank up to 2,779 ships in world war 2