OLGA arrives on site! With the arrival of Thomas Wiersberg, gas monitoring will be carried out during the drilling of the KFD1 borehole. The equipment can measure helium and radon besides other gases such as hydrogen, CO2 and hydrocarbons. The equipment has been set up at the drill site. Connections to the mud-gas separator (during mud drilling) and the air-gas separator (during air hammer drilling) will be established shortly. While such measurements have been carried out earlier with mud rotary drilling, this will be the first time that an attempt will be made to detect anomalous gases during air hammer drilling.