Who ever suggested it might be simple …

Extensive drilling equipment has been supplied to the Citybanan tunnel project in Stockholm, for the Stockholm Södra construction site. This includes, among other things, 8 down-the-hole hammers W100, W120, and W150 made by Wassara, more than 200 drilling tubes of the diameters 88.9 to 193 mm, as well as WASP150 high-performance pumps. The tunnel variant was chosen because restricted space conditions prevail in the overground area of the Old Town .
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