US Coast Guard crew of cutter Spencer watched as a depth charge exploded near U-175, North Atlantic, 500 nautical miles WSW of Ireland, 17 Apr 1943U-175 forced to surface after being depth charged by USCG cutter Spencer, North Atlantic, 500 nautical miles WSW of Ireland, 17 Apr 1943U-175 sinking, 17 Apr 1943Obersteurmann Helmut Klotzch of U-175 yelled for help after the submarine sank in the North Atlantic, 500 nautical miles WSW of Ireland, 17 Apr 1943
