(S (S (PP (IN During) (BASENP (DT the) (NN afternoon))) (COMMA ,) (S (NP (QP (ADVP (RBR more) (IN than)) (NN thirty)) (BASENP (NN rescue) (NNS teams))) (VP (VBD were) (VP (VP (VBN found) (PP (IN at) (BASENP (DT the) (NN scene)))) (COMMA ,) (S (S (VP (VBG wearing) (NP (BASENP (JJ hard) (NNS hats)) (CC and) (BASENP (NN oxygen) (NNS tanks))))) (SBAR (IN as) (S (BASENP (PRP they)) (VP (VBD prepared) (S (VP (TO to) (VP (VB enter) (BASENP (DT the) (NN mine))))))))))))) (PERIOD .))