Now, it is the best time to map HVDC SydVästlänken ( http://en.wikipedia.org/wiki/SydV%C3%A4stl%C3%A4nken ), which is now under construction and which will connect the substations of Barkeryd near Nässjo, Sweden with that of Hurva near Hörby, Sweden, as it is in most parts of its track implemented as underground cable and such installations can be best mapped at time of construction, because then you can see where the cables are buried.