Unidentified Living Organisms between manganese nodules 'Dust clouds' at the bottom of the deep sea, that will be created by deep-sea mining activities, descend at a short distance for the biggest part.
Unidentified Living Organisms between manganese nodules 'Dust clouds' at the bottom of the deep sea, that will be created by deep-sea mining activities, descend at a short distance for the biggest part. That is shown by PhD research of NIOZ marine geologist Sabine Haalboom, on the bottom of the Pacific Ocean. Yet, a small portion of the stirred-up bottom material remains visible in the water at long distances. "These waters are normally crystal clear, so deep-sea mining could indeed have a major impact on deep-sea life," Haalboom states in her dissertation that she defends at Utrecht University on May 31st.
Currently, the international community is still discussing the possibilities and conditions for mining valuable metals from the bottom of the deep sea. This so-called deep-sea mining may take place at depths where very little is known about underwater life. Among other things, the silt at the bottom of the deep sea, which will be stirred up when extracting manganese nodules, for example, is a major concern. Since life in the deep sea is largely unknown, clouding the water will definitely create completely unknown effects.
Variety of Instruments
For her research, Haalboom conducted experiments with different instruments to measure the amount and also the size of suspended particles in the water. At the bottom of the Clarion Clipperton Zone, a vast area in the depths of the Pacific Ocean, Haalboom performed measurements with those instruments before and after a grid with 500 kilograms of steel chains had been dragged across the bottom.
Read more at Royal Netherlands Institute for Sea Research
