Gcoba isigxobo ngokuya maphakathi nendawo yenqwaba, bese udweba i-arc eyindilinga ngomcako, bese umba umgodi ngesandla noma i-excavator ukuze umbe umgodi, ufake i-casing yensimbi, bese ucindezela umugqa wokudonsa wenqwaba elinganisiwe, ukuthi indawo emaphakathi yekesi iyafana nekaliwe futhi...
Funda kabanzi