(S (S (SBAR (IN Since) (S (BASENP (NN drilling)) (VP (VP (VBD began) (PP (IN at) (BASENP (NN 7pm)))) (BASENP (JJ last) (NN night))))) (COMMA ,) (S (BASENP (DT the) (NN machine)) (VP (VBZ has) (VP (VP (VBN made) (BASENP (DT a) (NN 2) (NN cm) (JJ wide) (NN pilot) (NN hole))) (NP (BASENP (NN half) (NN way)) (PP (TO to) (BASENP (DT the) (NNS miners)))))))) (PERIOD .))