Kuunza iyo KJ421 Hydraulic Tunnel Boring Rig - mhinduro yekupedzisira kune ako ese mugero anofinha zvaunoda.Muchina uyu muhombe wekuchera wakanyatsogadzirirwa kusangana nematanho ehukuru hwakasiyana, ane michinjikwa-chikamu kubva pa16-68 square metres.Iyo yekuchera rig ine super drilling kugona, inogona kuboora maburi uye mabhaudhi munzvimbo dzakamira, dzakarerekera uye dzakachinjika, uye chishandiso chakakosha pakuvaka tunnel.