National Geographic : 1943 Feb
202 The National Geographic Magazine x U. S. Navy, Oflicial With a Thunderous Roar Depth Charges Blast a U-boat's Lair in the North Atlantic and Save Merchant Ships from Torpedoes Two "ash cans," exploding simultaneously, raise geysers of death. This remarkable photograph suggests a gigantic bloom or a huge watery "V for Victory." It was taken from a speedy little PC boat of the United States Navy while an attack was being launched against an Axis submarine. Such fast submarine chasers, 173 feet long, are now prefabricated and turned out rapidly from the shipyards. They carry crews of about 50 men with three to five officers. Equipped with three-inch guns, they can put up a stiff fight against dive-bombing aircraft. Because of their maneuverability and deadly armament they are extremely effective.