(S (S (BASENP (PRP It)) (VP (VBZ is) (VP (VBN believed) (SBAR (S (S (S (BASENP (DT the) (NN two) (NNS dead)) (VP (VBD had) (VP (VP (VBN been) (PP (IN in) (BASENP (DT the) (NN water)))) (PP (IN for) (NP (QP (ADVP (IN at) (JJS least)) (NN three)) (NNS hours)))))) (SBAR (IN before) (S (BASENP (PRP they)) (VP (VBD were) (VP (VBN recovered)))))) (CONJP (COMMA ,) (CC and)) (S (VP (VBD died) (PP (IN from) (NP (BASENP (DT the) (NNS effects)) (PP (IN of) (BASENP (NN hypothermia)))))))))))) (PERIOD .))