(S (S (BASENP (NN 13) (JJ American) (NN coal) (NNS miners)) (VP (VBD were) (VP (VP (VBN trapped) (NP (BASENP (NN 2) (NNS miles)) (PRN (LRB -LRB-) (BASENP (NN 3) (NNS kilometers)) (RRB -RRB-)))) (PP (IN inside) (NP (BASENP (DT the) (NNP Sago) (NN coal) (NN mine)) (PP (IN in) (NP (BASENP (DT the) (NNP US) (NN state)) (PP (IN of) (BASENP (NNP West) (NNP Virginia)))))))))) (PERIOD .))