Mubikorwa byo gucukura tunnel, kugirango bigabanye kandi bisohore umwotsi wimbunda, umukungugu, imyuka yangiza nubumara bwangiza biterwa no guturika, no gukomeza akazi keza, birakenewe guhumeka isura yubucukuzi bwa tunnel cyangwa ahandi hantu hakorerwa (ni ukuvuga, ohereza ...
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