(S (S (BASENP (PRPD Their) (NNS vessels)) (VP (VBD were) (VP (VBN found) (S (VP (VBG hiding) (PP (IN in) (NP (BASENP (NNS mangroves)) (PP (IN off) (BASENP (DT the) (NNP Kimberley) (NN coast)))))))))) (PERIOD .))