Sethula i-KJ421 Hydraulic Tunnel Boring Rig - isisombululo esiphezulu sazo zonke izidingo zakho eziyisicefe zomhubhe. Lo mshini omkhulu wokubhoboza uklanyelwe ngokukhethekile ukuhlangabezana nemigudu yobukhulu obuhlukahlukene, enezigaba ezinqamulayo ezivela ku-16-68 square metres. I-drilling rig inamandla amakhulu okubhola, ingamba izimbobo eziqhumayo namabhawodi endaweni eqondile, ethambekile futhi evundlile, futhi iyithuluzi elibalulekile ekwakheni umhubhe.