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On the occasion of a review of safety aspects related to possible earthquake occurrences in the area of the two nuclear power reactors at Betznau, several shallow boreholes were drilled on behalf of Nordostschweizerische Kraftwerke AG on Beznau island in the river Aare during winter 1979/80. One of the borings (coord. 659491/267242) located approx.75 m NNE of reactor building II was cored over its total length and taken to a greater depth of 321.8 m. Because this well offered a good opportunity to gather important results for the research program of Nagra in northern Switzerland, it was investigated in a very comprehensive way with sedimentological, mineralogical and geochemical methods and with geophysical, rock-mechanical, hydrogeological and radio isotope techniques. This is the first deeper borehole drilled in Switzerland that has been evaluated to such a great extent. The results of the investigation are presented. (ERA citation 12:008974)