Is the saw-like device on the front of a U-boat intended for

Is the saw-like device on the front of a U-boat intended for

How did U-boats avoid to sink friendly ships? How did they make

Did any U-boat shoot down a plane? - Quora

Why were U-Boats numbered instead of named? - Quora

How did destroyers sink U-boats? - Quora

Did any U-boat shoot down a plane? - Quora

How did destroyers sink U-boats? - Quora

Why were U-boats so dangerous and difficult to destroy? - Quora

How successful were U-boats in sinking different types of ships

If a U-boat is scuttled, does the crew die? If not, how do they