Figure F2. Example of drilling conditions for Hole SEG62A using the British Geological Survey's Rockdrill showing penetration and fluid pressure vs. time using a surface stepped–profile diamond bit and Tasiilaq insert. Rapid penetration to 0.42 m in sedimentary overburden was followed by steady penetration in volcanic basement with frequent stalling to 0.94 m, where no further progress was possible.

Figure F2. Example of drilling conditions for Hole SEG62A using the British Geological Survey's Rockdrill showing penetration and fluid pressure vs. time using a surface stepped–profile diamond bit and Tasiilaq insert. Rapid penetration to 0.42 m in sedimentary overburden was followed by steady penetration in volcanic basement with frequent stalling to 0.94 m, where no further progress was possible.