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From EU funded project ASSEM (Array of Sensors for Seabed Monitoring of geohazard), some innovative monitoring devices have been demonstrated. The activity on the seabed of a very active seismic area in the Gulf of Corinth in Greece was measured. The parameters driving slope instability were acquired in the Finneidfjord in Norway. From these pilot experiments a discussion of some criteria for the choice of laying cabled observatories or non-cabled subsea observatories is proposed.