To fulfil this requirement an environmental biomonitoring study with blue mussels will be run around the Martin Linge field. A vessel has been out to the oil field to place a number of rig stations with mussels in the water column around the platform for the field monitoring. The field is located 42 kilometres west of Oseberg, at a water depth of 115 metres. In the meantime an experimental exposure to mimic the biological effects of periodic drilling activities will be set up under laboratory conditions in the facility of IRIS-Environment at Mekjarvik. Several biological indexes of stress will be analysed both in the laboratory and in the field.