Keawaula Cable Route Survey

Customer: Earth Sciences & Surveying

Start Year: 2007 End Year: 2007

City/Town: Keawaula, Hawaii, United States

SEI completed the cable route survey for the Keawaula landing of the
Australia-Hawaii cable system. The survey included a small boat geophysical survey, a beach topographic survey and a diving survey at Keawaula (Yokohama) Bay on the west side of the island of Oahu. The small boat survey overlapped with the main vessel survey and consisted of multibeam bathymetry, side scan sonar imaging, magnetometer data and subbottom profiles from the shoreline to the 20m depth contour.  The beach topographic survey extended from the water line to 100 meters inland of the beach manhole. The diver survey, including bottom probing, depth measurements and video was swum from the 12m depth to the beach. Survey results were presented in a final report that presented seafloor maps and a discussion of methods, findings, and potential obstacles to cable routing.