Fortifications near to Reimarla

First idea of land defence of Sveaborg fortress dated of 1907. It become clear after Port-Arthur fortress fall every maritime fortress need in reliable land defence. Construction works began in 1914 only. Shortly works were stopped and plans were corrected because of new war experience gained. Works were resumed in 1915 and endured till the 1917.
Concrete trench of the front line with the shelter is on the picture.