Ага, там копали с черти какого времени (чуть ли не с XIV века), вот и ушли так глубоко. "Piast II shaft - the main shaft of the mine, was sunk to the level of VII, which is located 700 m underground. He had two 4-storey frame runs. Elevator transporting people at 8 m / s, while the output speed of 16 m / s" Хотя может конечно имеется ввиду глубина не от этого места, а от поверхности земли.
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техники жаль мало
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"Piast II shaft - the main shaft of the mine, was sunk to the level of VII, which is located 700 m underground. He had two 4-storey frame runs. Elevator transporting people at 8 m / s, while the output speed of 16 m / s"
Хотя может конечно имеется ввиду глубина не от этого места, а от поверхности земли.
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