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Marine Services :: Hydrographic and Nautical Charting

SEALink South Marine Route Survey

Ketchikan, AK

DEA Marine led a comprehensive geophysical survey for the SEALink South submarine fiber optic cable project across more than 80 nautical miles in southeast Alaska. Tasked by Alaska Power and Telephone (APAT), DEA executed an advanced deep-water survey connecting the communities of Hollis, Ketchikan, and Coffman Cove. This included multibeam bathymetry and backscatter, side scan sonar, sub-bottom profiling, and marine magnetometry, establishing a detailed corridor for the fiber optic cable. Employing the Point Lavina equipped with state-of-the-art technology like the Teledyne Reson T50 sonar, DEA delivered comprehensive data, ensuring environmental protection and safety protocols, including COVID-19 measures. This data facilitated critical design and installation decisions, marking DEA’s commitment to technological excellence and innovation in challenging maritime environments.


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