Drilling i te rigs-raa-hia te faaohipahia nei i roto i te tere mineral, tupita o te apoo, te pape i te apoo pape e te investigations i te vahi i reira ratou. Te cylinder e oia i te hopoiʻa te ikot e te maitai i roto i te drilling i te ohipa. Ua faataahia to tatoucylinders na roto i te maramarama hope roa i te huru no te raveraa i te ohipa e te tahoeraa fatata roa i to tatou mau hoani, o te faataa maitai i te no te aha to tatou cylinders noa rave i te maitai e aita roa i vaiiho i to tatou mau hoani i te.