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The Ninth Fort is the realization of Professor Velichko newest plan. The fort construction lasted until 1913 and cost 850,000 Roubles. At that time, the project of the Ninth Fort was innovative as all fortification rooms were concrete. The thickness of ceiling reached 1.5-2 m, and different parts of the fort had safe connections via underground galleries. The fort had electricity and forced air ventilation system in tactical purpose rooms.
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