Description
The gros ouvrage (large work) is composed of 17 combat blocks and 18 artillery pieces, with a total of 10 kilometres (6.2 mi) of galleries. The galleries are between 25 and 30 metres (82 and 98 ft) below the surface to protect against bombardment. The main gallery extends 1,884 metres (6,181 ft) .
Read more about this topic: Ouvrage Hackenberg
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