Sea Technology

FEB 2013

The industry's recognized authority for design, engineering and application of equipment and services in the global ocean community

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Fly-Away Deep Ocean Salvage System (FADOSS). All equipment was transported over land from Phoenix���s facility in Largo to Dover Air Force Base in Delaware. From there, military transport aircraft moved the equipment to Hawaii, where the gear was loaded aboard USNS Navajo (T-ATF 169). After a 10-day transit to the crash site, underwater search operations commenced using the Navy���s 20,000-fsw-depth search system, ORION. After searching the initial planned 2-by-4-nautical-mile area, search operations shifted to another high-probability area and the suspected F-16 debris feld was identifed. Next, Phoenix personnel deployed the CURV 21 ROV and conducted a video survey of the area in which the fight data recorder and engine were identifed. Over the next 10 days, the Phoenix team piloted the CURV 21 ROV through 12 dives and recovered all critical items desired by the embarked accident investigating board. During operations, the team faced extreme water depths and adverse weather conditions, including erratic high winds, large waves and strong currents. at the pit during the previous time it was surveyed a few months earlier. Using a three-year average age for Google Earth imagery, the odds of this coincidence are about 1 in 25,000. 4.4-Terabyte-Per-Second Rate Achieved on Submarine Cables TE SubCom (Morristown, New Jersey) has demonstrated 100 gigabyteper-second-per-wavelength coherent transmission over transatlantic distances in feld experiments, the company announced in January. Capacity on a single fber was determined to reach 4.4 terabytes per second with SubCom���s C100 transceiver, which is designed to optimize DPQPSK coherent transmission in submarine cable systems with reaches up to 11,000 kilometers. The C100 technology applies to new systems based on +D fbers, as well as upgrades to existing systems with dispersion managed fber. The C100 transceiver has demonstrated capabilities of up to 15 terabytes per second on beta hardware prototypes. n Remote Hydrographic Survey Boat Caught on Google Earth Surveyors from Select Energy Services (Houston, Texas) were surprised to see one of their ROV���s hydrographic activities photographed and incorporated into Google Earth. The team was preparing to do a hydrographic survey of a water holding pond for a natural gas fracturing operation using the Oceanscience (Oceanside, California) Z-Boat 1800 remote hydrographic survey boat. The Z-Boat incorporates a single-beam echosounder, GPS and telemetry system. Prior to leaving for the survey site, the Select Energy Services process calls for the Google Earth map of the pit to be uploaded to the acquisition software to provide a background image for the survey plan and to offer clients a familiar perspective when viewing the fnal survey product. The Google Earth image showed a small yellow dot in the middle of the frac pit that seemed to have a wake behind it. When the image was zoomed in, the Z-Boat was clear in the satellite picture. The photograph in Google Earth was taken exactly when the boat was www.sea-technology.com FEBRUARY 2013 / st 81

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