under wraps –adj. something that is being withheld or hidden for a later time

holy grail – (literary) n. something that is greatly desired but is very hard to get

mast – n. a tall pole on a sailing ship that supports a sail or sails

sonar – n. a device that uses sound waves to find things underwater

engravings –n. details that are cut into the surface of wood, stone or metal

cannon – n. a large, heavy run

sediment – n. material that sinks to the bottom of water forming a layer

gratification – n. a feeling of being happy or satisfied with something

moment – n. a point in time

exploit – v. to use up, often in an unfair way