(S (S (NP (BASENP (NNP Vessel) (NNP 3504) (POS 's)) (NN crew)) (VP (VBD were) (VP (VP (VBN located) (PP (IN on) (BASENP (NNP Sibay) (NNP Island)))) (PP (IN by) (BASENP (DT the) (NNP Philippine) (NNP Air) (NNP Force)))))) (PERIOD .))