This unfinished Salpa Line site on the north-eastern side of Soikonvuori features a large accommodation tunnel and two rock-cut machine gun emplacements. The 85-metre tunnel was intended to house 80 people, with planned observation and defence structures that were never completed. The entrance shafts, including one steep vertical shaft from the cliff top, remain unfinished and partially filled with sand. The site lies in a mixed forest area and is accessible via marked paths, though the terrain may be uneven and rocky in places.