How many lives did the Germans kill on the boats?

The exact number of lives lost due to German attacks on boats during World War II varies significantly depending on the context, such as naval engagements or the sinking of civilian vessels. One notable instance is the sinking of the RMS Lusitania in 1915, where 1,198 lives were lost, but this was during World War I. In World War II, German U-boats sank thousands of merchant ships, resulting in the deaths of tens of thousands of civilians and military personnel. Overall estimates suggest that U-boat actions may have caused around 750,000 deaths.