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Mannerheim Line
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===First large bunkers 1932–1937=== [[File:Sk 10 inside beds Winter War.png|thumb|Troop beds in a destroyed bunker on the Mannerheim Line. The bunker is probably Sk 10, built in 1937.]] The second construction phase started on 1 April 1934, with Fabritius in command of the construction work. He designed two new kinds of bunker, Ink 1 and Ink 2. The bunkers were mainly designed for troop accommodation, but loopholes were crafted into armour plate in 1938 and 1939. A bunker was typically 15–20 meters in length and 5–6 meters wide. A pioneer battalion constructed six bunkers in the [[Inkilä]] sector.<ref name="UittoGeust2" /> Between 1932 and 1938 the defence budget was such that the Finns could only construct two or three bunkers per year. In 1936 and 1937 they constructed two large strong-points, Sk 10 and Sj 4 in the [[Summankylä]] and [[Summajärvi]] areas. Two smaller bunkers, Le 6 and 7, in the [[Leipäsuo]] sector, and Ink 6, in the Inkilä sector, were also built. New bunkers differed from earlier designs in that their troop accommodation was located between the gun chambers, thus saving the cost of expensive [[reinforced concrete]]; the roof was protected by two to three meters of soil and one to three meters of stone rubble.<ref name="UittoGeust5">[[#UittoGeust2006|Geust & Uitto 2006]], page 39</ref>
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