This is the Martin JRM Mars, the world’s largest seaplane. Commissioned by the U.S. Navy in 1938 for long-range ocean patrol, it had a 61-meter wingspan, over 35 meters in length, and was powered by four Wright R-3350 engines producing 10,000 horsepower. With a maximum takeoff weight of 74.8 tons, it could fly more than 5,300 kilometers. Its cabin carried 133 fully armed troops, 15 tons of cargo, or seven Willys jeeps. On its 1942 maiden flight, two smaller planes sat on its wings to highlight i