There are a lot of unwritten laws in nature and in experimental science. After the one that sais 'what can go wrong, will go wrong' there is the one that sais 'and the probabability that it will happen always is higher towards the end'.
We discovered a problem in the newly installed sensor of the eddy covariance of course on our last trip to the station on the glacier before my departure. It meant we had to take it down again, and also of course there was a snow storm the next day which made it impossible for us to leave the station. So in order to take the sensor down again and bring it back from Antarctica for repair purposes, we left early in the morning of my departure day counting on that the helicopter wasn't going to arrive before 9am. Thanks to the excellent support of Campbell Scientific, we had everything prepared so that setting up our exchange sensor for the interim time. We made good time in a beautiful morning setting of light on the glacier and the Potter cove.