Dredging - is another form of surface mining where the environmental impacts are primarily found underwater. The method of extracting material from the seafloor or any water body leads to the harmful risk of marine life. Overall, the effect are far less compared to the other mining methods. The influx of sediment can burry flora and fauna, change water levels and can alter the oxygen content. Water and noise pollution is a concern that must be monitored because marine life is very sensitive and vulnerable to drastic and harmful changes within their ecosystem.