"EXPLODING THE DEPTHS -- Somewhere in the Atlantic U.S. Coast Guardsmen watch the explosion of a depth charge, hope to see a [tell-tale] sign of the success of their vigilance. The Coast Guard cutter is on convoy patrol, shielding the merchant ships from U-Boats." Official Coast Guard Photo # 3147 USCG Historian's Office Special Collections Archive & Library; World War II Subject File; "North Atlantic Campaign" box. 2nd floor archives room, Atkins Hall.