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www.sea-technology.com October 2015 / st 17 boat but also as a result of the varying operating pat- terns used to optimize the data collection. From these distances, the ASV opera- tors were able to maintain a visual over the vehicles and maintain uninterrupted communication links. ASV worked closely with Seiche to integrate towed hydrophone arrays onto the C-Enduro and C- Worker ASVs to carry out the PAM. C-Worker de- ployed the array on a cable 220 m long, and C-Enduro towed a smaller cable 55 m long. The LADC-GEMM survey launched a new platform for collecting passive acoustic data by integrating the Seiche wireless PAM system and hydrophone arrays with ASV vehicles. The Seiche wireless PAM systems were housed within their own watertight modules and mounted on the ASVs. The systems comprised a 12-bit ADCP sampling at 500 kHz, a compact processing electronics module, Wi-Fi connectivity and 6 Tb of integrated storage. Both systems ran independently, processing, analyzing and storing data autonomously. In addition, the PAM operators on board the support vessel RV Pelican were able to create a remote con- nection from a PC and monitor the system. Conclusions The principle objective of the survey was to record continuous passive acous- tic data from both PAM systems deployed on the ASVs for post-processing and analysis in the com- ing months. In addition, real-time monitoring and localizing of deep-diving marine mammals was con- ducted, utilizing the Wi-Fi connectivity, to provide initial cues of call rates and distribution in the area. The detailed analysis will then feed into the three-year BP/ GoMRI-sponsored project to investigate the impacts of the Deepwater Horizon disas- ter on marine mammal populations within the spill areas. The autonomous PAM system was confgured to detect species from their acoustic phonations over a range of 20 to 160 kHz. These would include the low-frequency calls of Brydes whales, the broadband regular click patterns of sperm whales, higher-frequency clicks and whistles of sev- eral different dolphin species, and the high-frequency echo- location pulse trains of beaked whales and kogia. PAM is increasingly used by the scientifc community to monitor marine mammal sounds for mitigation and re- search. Towed hydrophone arrays can be easily incorporat- km.kongsberg.com K-Lander is a highly fexible, scalable, sensor carrier platform with integrated and advanced cNODE ® communication technology designed to deliver data from the seabed. The integrated recovery system, up to thirty cNODE ® batteries and DPU for power management, data storage and processing combine to allow long duration operations for various subsea monitoring applications. A range of sensors for leak detection can be integrated such as active acoustic instruments, dissolved gas sensors and various other oceanographic sensors. MODULAR SENSOR PLATFORM FOR SUBSEA LEAK DETECTION Coastal map of the Gulf of Mexico areas affected by the BP Deepwater Horizon oil spill.