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USS Tampa WW1 shipwreck found off coast after being torpedoed by German U-boat

The US Coastguard Cutter TAMPA was torpedoed by a German U-boat in 1918 off the Cornish coast, and all 131 lives onboard were ...

What does the 'U' in U-boat stand for and how many of them are left?

Few naval vessels have developed as enduring of a legacy as German U-Boats, but what does that name actually mean?