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The NEMO (NEutrino Mediterranean Observatory) Collaboration installed, 25 kmE offshore the port of Catania (Sicily) at 2000 m depth, an underwaterlaboratory to perform long-term tests of prototypes and new technologies for anunderwater high energy neutrino km$^3$-scale detector in the Mediterranean Sea.In this framework the collaboration deployed and successfully operated forabout two years, starting form January 2005, an experimental apparatus foron-line monitoring of deep-sea noise. The station was equipped with 4hydrophones and it is operational in the range 30 Hz - 43 kHz. This interval offrequencies matches the range suitable for the proposed acoustic detectiontechnique of high energy neutrinos. Hydrophone signals were digitizedunderwater at 96 kHz sampling frequency and 24 bits resolution. A customsoftware was developed to record data on high resolution 4-channels digitalaudio file. This paper deals with the data analysis procedure and first resultson the determination of sea noise sound pressure density curves. The storeddata library, consisting of more than 2000 hours of recordings, is a uniquetool to model underwater acoustic noise at large depth, to characterise itsvariations as a function of environmental parameters, biological sources andhuman activities (ship traffic, ...), and to determine the presence ofcetaceans in the area.

NEMO-\onde: a submarine station for real-time monitoring of acoustic background installed at 2000 m depth in the Mediterranean Sea