This map shows the location of the submarine cable off the central California coast that was being used for the Sound in the Sea Acoustic Monitoring Project. This cable stretched approximately 100 km, from Pillar Point Air Force Station to the underwater seamount known as Pioneer Seamount. A passive underwater hydrophone was installed on the seaward end of the cable. Data on recorded sounds was relayed via the cable for processing at a station on land. Image courtesy of Sounds in the Sea 2001, NOAA/OER.