This under-construction main sewer, realized with a "tunneler" cross the "Bois de Boulogne" from east to west. An all the more nice walk since it can be done with a small train.

The Montreal Harbour Station and its surroundings conceals many closed down underground passages and some warehouse between the railroad and the river.

Telephone, water, electricity and so on, all these networks run under the sidewalk or the buildings, sometimes joining to each other to create bigger maze. It could happen that, even if it was not planed that they communicate, two galleries are few inchs away from doing it.

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