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achieved acoustic activities applications area survey Arunachal Pradesh Assam beamwidth bottom Campos Basin collector commercial companies continental shelf Contingency Plan cost crude deep sea DESO 25 drilling echosounder economic energy engineering environmental equipment estimated facilities fan-type echosounders feasibility fish foreign frequency gas lift hydrocarbon implementation important increase Indian industry installed investment lift system major manganese nodules MARINE INDIA meters mid-ocean ridges million tonnes mineral mining system Nahorkatiya and Moran narrow beam natural gas North East offshore oil and gas oil field Oil India Limited oil production ONGC OOIP operation ēr ēr ēr parametric effect Parasound system PETROBRAS petroleum phase pipe pipeline polymetallic nodules ports potential present programme pumps recording reserves reservoirs sector sediment seismic ship spills surface swath technical transducer vessel water depth width