The trapdoor in the basement of this house leads to a vertical bottleneck passage, 41 cm in diameter. Josef Weichenberger checks that Jérôme can extricate himself from the bottleneck passage without too much difficulty; Upper Austria, February 2024. [1507N043 © Jérôme et Laurent Triolet/www.mondesouterrain.fr]

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Reference : 1507N043