About a month ago I worked on an archaeological preliminary investigation in Mellingeholm, just south of Norrtalje. Besides ancient monuments like graves, grave fields, settlements etc. There were also a lot of remains from the military, who used this area as practice field by the regiment Lv 3. Among the more memorable owns are these trenches (Frötuna 130 and 131) probably built in the 50’s.
The trenches are about 1,5-1,7 m in depth and ca 20-50 m in length.