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atest Marine Events in Pictures Below—Submarine V-4, largest in the world, also first undersea boat mine layer. Commissioned by the United States navy April 2, 1928, at the Ports- mouth, N. H., navy yard where she was built Above—Pipe line suction dredge at work at the dock, inner harbor, Balboa, C. Z. Constant deepening and improving of channels is part of the upkeep of the Panama Canal Below—Interior of upper cabin of the Key System ferryboat Yerba Buena, built by the Moore Dry Dock Co., Oak- land, Calif. At Left—Philip DeRonde, founder and for thirteen years, president of Ori- ental Navigation Co., recently elected chairman of the board of directors of the company At Right—Panama Canal 250- ton floating cranes, Ajax and Hercules, built in Germany. Also crane boat Lavalley built by the French in 1887 Above—Launching Panama Canal tugs Chagres and Trinidad by lifting them from the side of the drydock with two 250-ton cranes shown at right. Descrip- tion of these tugs will be found in the April issue of Marine Review, page 52 At Left — Oertz streamline rudder on diesel tanker, Sunoil. It lessens resistance At Right — Self- unloading steamer, John W.. Board- man, helpless in ice on Lake Hu- ron at Fort Gra- tiot light opposite Port Huron MARINE REVIEW—May, 1928 35,