Position: 88 58.7' N, 111 31.1' W, temperature <- 40° C, air pressure 1017 hPa, wind 13 knots from NNW. Ice drift 0.2 knots towards east. Shooting seismic reflection all day. The diesel generator had a cracked fuel line which needed repair at 0400 hours. The air compressor is struggling as the pre-heating is getting marginal at these low temperatures