The information in this chapter focuses exclusively on the activities to be undertaken in marine mining licence ML 170 located some 120 km to the southwest of Walvis Bay (Figure 1). The key operational aspects for the marine component of the project for SP-1 comprise: Recovery of phosphate sediment from water depths of 200 m to 225 m; An annual recovery volume of 5.5 million tonnes of phosphate rich sea bed material to a thickness of up to 3 m, extracted from an area of up to 3 km2, 60 km2 for the 20 year period of the mine licence issue; The phosphate sands will be recovered by a trailing suction hopper dredger (TSHD); A large hopper (space where the slurry is stored onboard) provides for economy of scale; TSHD technology is proven and is supported by well known established environmental protocols; and, Conducting the marine operation in a safe and responsible manner with respect to the conditions at sea, and other marine.