(eng. tunnel) putili hodnik probijen kroz brdo ili ispod rijeke, podzemni put (osobitoželjeznièki), podzemniprolaz
TUNEL
podzemni prolazprokopan kroz brdo, ispodrijeke ili mora. Služi za provođenje prometnica ili u hidrotehničke svrhe(vodovod, odvodnjavanje, dovod vode uhidroelektrane).
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