New 8x10 Photo: Coast Guard Sinks Nazi U-Boat Title - U.S. Coast Guard Sinks Nazi U-Boat, 1943 Description - Sinking of U-175. Coast Guardsmen on the deck of the U.S. Coast Guard Cutter 'Spencer' watch the explosion of a depth charge which blasted a Nazi U-boat's hope of breaking into the center of a large convoy. Description Source - Library of Congress Year - April 17, 1943 SKU - WW-0043