The Naval Ammunition Depot Hastings (NAD Hastings) near Hastings, Nebraska was the largest United States World War II naval munitions plant operating from 1942 to 1946 and produced over 40% of the U.S. Navy's munitions. History World War II and accidents The former Naval Ammunition Depot (NAD) is one of Nebraska's four major former ammunition plants: the Cornhusker Ordnance Plant, the Nebraska Ordnance Plant and the Martin Bomber Plant. Its construction began in July 1942 on and was completed in early 1943 with over 2,000 buildings, bunkers, and various other types of structures. The cost of construction was over $71 million. The Navy built in this location due to the proximity to the area's three railroads, the abundance of underground water, cheap natural gas and electricity, the stable work force, and the distance from either coast (being well beyond the range of Japanese or German bombers). At one point during World War II the facility was producing over 40% of the U.S. Navy's munitions. It manufactured 40 mm shells, 16-inch projectiles, rockets, bombs, depth charges, mines, and torpedoes. Production peaked in June–July 1945, when the depot employed 125 officers, 1,800 enlisted men, and 6,692 civilians. The impact on the city of Hastings was a 40% population increase from just over 15,000 in 1940 to 22,252 at its peak during the war. By 1944, workers' base wages at the depot were 74 cents an hour with time-and-a-half for overtime beyond 54- to 64-hour workweeks, considerably higher than the 40- to 50-cents per hour in town and maybe a dollar a day for a hired man on the farm. Farmers experienced a severe labor shortage, schools were overcrowded with 50-60 children, and new homes were scarce. Four accidental explosions took place during the war, of which two were officially reported. All occurred in 1944, and together resulted in the deaths of 22 people. The first accident left a crater 550 feet long, 220 feet wide, and 50 feet deep. The most severe accidental blast killed nine people and injured fifty-three on September 15, 1944. It was caused by human error while a train was being loaded. The loading depot and the train were totally destroyed. Part of the roof at a high school in Harvard, about east of Hastings, collapsed as a result of the explosion; injuring 10 children. After World War II In April 1945, the work week was reduced from