Uma udinga ukuhamba ngesivinini esiphansi ezindaweni ezingalingani noma emhlabathini othambile kakhulu, ungakhetha i-drilling rig ene-crawler track undercarriage. Ukuzinza kwe-rig kuncike endaweni engaphezulu yethrekhi. Ngakho-ke, lapho ithrekhi ibanzi, i-rig izinzile. Kodwa amathrekhi abanzi kakhulu avame ukuguga ngokushesha futhi alimaze phansi lapho ehamba, ikakhulukazi lapho ephenduka. Umshini wokumba olandelwayo uhamba cishe ngo-4 km/h, okuwenza ulungele ukusebenza okudinga ukushayela okuncane.