Survey & Exploration in the Central Indian Ocean Basin (CIOB) mine site was continued for revalidation of relative concentration and quality characteristic of nodules in different pre-determined blocks. The sampling at a grid interval of 12.5 km in the pioneer area has been completed and one at a interval of 5 km has been initiated.The data are being analysed for revalidation. As a part of obligation as a pioneer investor, the department relinquished 10% additional site area to the International Seabed Authority.