Fig. 1: Field site and groundwater collection using inflatable packers.
From: Candidatus Desulforudis audaxviator dominates a 975 m deep groundwater community in central Sweden
a Location of the COSC-2 borehole within Sweden (Lat 63.3124° N, Lon 13.5265° E). b Lithology of the borehole according to depth and the position of the packers used for isolating the groundwater-bearing fracture at 975 m below the surface (not drawn to scale). c Detail of the packers used during sampling. The packers (76 mm in diameter) were inflated against the borehole wall (96 mm in diameter) by pressurizing the rubber shell (gray surface) with water, thereby preventing to sample groundwater from other fractures intersected by the borehole. The samples for hydrochemistry were collected using both pumped water and an in situ sampling device that allowed water collection at the desired depth.
