It is favored easy exploitation during the industrial revolution of raw materials for iron making. rocks of silurian age are overlain by middle coal measures and thus thick seams of high quality silurian limestone occur close to or directly underlie abundant seams of coal, iron ore and fire clay. it is a huge underground limestone mine and is abandoned little by little. this abandoned limestone mine is now the world largest indoor bike park. you are trapped inside the limestone mine, when you are going to park your bike there. no one is there to help you. at that time, how can you search for the objects and solve the puzzles to open the main door and escape from the abandoned limestone mine.
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