A "Moon Pool" is an opening in the deck of a ship or offshore platform that allows direct access to the water below. It is often used in marine operations, such as underwater construction or research, providing a safe and controlled environment for divers and equipment. The design helps minimize the effects of waves and currents, making it easier to work underwater. Moon pools are commonly found on vessels like research ships and drilling rigs. They can vary in size and shape, depending on their intended use. The concept is essential for activities related to oceanography, marine biology, and oil exploration.