(S (S (BASENP (PRP They)) (VP (VP (VBP collect) (PP (IN in) (BASENP (DT the) (JJ huge) (NN bay)))) (CC and) (VP (VB meet) (NP (BASENP (JJ tidal) (NNS flows)) (PP (IN from) (BASENP (DT the) (NN ocean))))))) (PERIOD .))