f Resistivity measurements on the sea bottom

In connection with the construction of a sub-sea tunnel under the 1050m wide and 35m deep Maursund strait, the Norwegian Public Roads Administration had the foilowing preinvestigations carried out: 1. Refraction seismies on the sea bottom. 2. A cored borehole from the shore 290m along the tunnel trace. 3. Acoustic tomography between the sea bottom and the borehole. 4. Resistivity measurements on the sea bottom. 5. Resistivity tomography between the sea bottom and the borehole. 6. Resistivity logging in sounding drillholes in front of the tunnel face. This paper reports the results from the resistivity measurements on the sea bottom and between the sea bottom and the diamond drillhole.