water bubbles make great scene from underwater aquarium glass

water bubbles make great scene from underwater aquarium glass , The fish hunted for food and the coral hunted for ornament by primitive divers are still sought by contemporary skin divers and scuba divers. An improved spear gun devised in the 1930s is used for food hunting, and special underwater cameras are widely used for recreational and scientific purposes. In addition, scuba diving has been useful scientifically in oceanography, in the study of fish and other marine organisms, and in the study of water pollution, as well as in the exploration of ships on the ocean floor and for salvage work, in which the earlier diving helmet with air line from on shipboard has been largely replaced.