[en] Posiva Oy submitted an application to the Finnish Government in May 1999 for the Decision in Principle to choose Olkiluoto in the municipality of Eurajoki as the site of the final disposal facility for spent nuclear fuel. A positive decision was made at the end of 2000 by the Government. The Finnish Parliament ratified the decision in May 2001. The decision makes it possible for Posiva to focus the confirming bedrock investigations at Olkiluoto, where an underground rock characterisation facility, ONKALO, will be constructed. As a part of the investigations Suomen Malmi Oy (Smoy) core drilled six 24.87-40.35 m long drillholes with a diameter of 56 mm in ONKALO in September-October 2007. The identification numbers of the holes are ONK-PP115 - ONK-PP120. The drillholes were drilled for installation of extensometers. The extensometers were installed for long-term monitoring of rock mechanics, rock stress and elastic parameters around the personal shaft at level -180. In addition to the drilling, Suomen Malmi Oy did core logging, drillhole deviation surveys and reporting. The deviation of the drillholes was measured with the deviation measuring instruments EMS and Maxibor. The main rock types are diatexitic gneiss and pegmatitic granite. Sections of veined gneiss, mica gneiss, quartz gneiss and mafic gneiss occur in some places. The average fracture frequency is 0.2-2.3 pcs/m. The average RQD values are 96.6-99.8 %. (orig.)