Design and Construction
The Immerhof farm site was surveyed by CORF (Commission d'Organisation des Régions Fortifiées), the Maginot Line's design and construction agency, in 1930. Work by the contractor Duval of Nancy began in 1931, and the position became operational in 1935, at a cost of 31 million francs.
Immerhof was the only ouvrage to be built using entirely cut-and-cover techniques, with no tunnelling, due to poor soil conditions. A high water table meant that the drinking water well was only 28 metres (92 ft) deep; no deep drain could be constructed under the galleries due to the shallow water table. The position was constructed entirely in reinforced concrete, as opposed to unreinforced mass concrete, causing a significant cost increase. It was named after a nearby farm.
Read more about this topic: Ouvrage Immerhof
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