Several similar approaches have been tested, although they use a turbine rather a moving chain to generate energy: http://euanmearns.com/a-review-of-underwater-

Several similar approaches have been tested, although they use a turbine rather a moving chain to generate energy: http://euanmearns.com/a-review-of-underwater-compressed-air-storage/ http://euanmearns.com/a-review-of-underwater-compressed-air-....