(S (S (BASENP (DT A) (ADJP (NN five) (NN tonne)) (NN borer) (NN drilling) (NN machine)) (VP (VBZ has) (VP (VBN been) (VP (VBN secured) (PP (IN in) (NP (BASENP (NN place)) (SBAR (S (VP (TO to) (VP (VP (VB drill) (BASENP (DT a) (NN one) (NN metre) (NN hole))) (PP (IN through) (NP (NP (BASENP (DT the) (JJ remaining) (NN 12-16) (NNS metres)) (PP (IN of) (BASENP (NN rock)))) (SBAR (WHNP (WDT that)) (S (VP (VBD fell) (PP (IN into) (BASENP (DT the) (JJ main) (NN shaft)))))))))))))))))) (PERIOD .))