Over the past five years, SOWEIT has completed a number of marine engineering projects in the field of marine surveying and mapping technology services, such as site selection survey, construction pre-survey, ship navigation and positioning, mapping services for the installation of above-water and submerged structures, tracking survey, completion survey, operation and maintenance inspection, and harbour and waterway inspection. Among them, the technical service of cable laying is 1,360km, installation of 278 above-water and underwater structures, 2 floating wind power projects; 8700km of sea sweeping pre-survey, 860km of submarine pipeline and cable re-survey, 65 wind turbine inspections, 13 times of cable repair service, and a number of other above-water and underwater surveying and mapping projects in harbours and pools, rivers and lakes, and so on. Especially in the full underwater and deep water area, SOWEIT has rich experience and leading technical advantages,  with the maximum operating depth of 1500 metres.