Texas tower radar station on Georgia Shoal. Radar screen. Early warning radar station against enemy attack. Man plotting points on a large glass map. Huge dredger off Long Island, New York. Sand is brought up into giant hoppers. CU man’s hands filled with sand. Off Florida’s west coast, sponges brought to surface by a man in 50s diving suit. Sponges shaken out onto the deck of a ship. Men in speedboat harvest kelp off the Oregon coast. Gulf of Mexico - hydraulic dredge in Galveston Bay pumps oyster shells into barges.