(S (S (BASENP (PRP They)) (VP (VBP say) (SBAR (S (BASENP (RB only) (DT the) (NNP Maritime) (NNP Industry) (NNP Authority)) (VP (VBZ is) (VP (VBN allowed) (S (VP (TO to) (VP (VB investigate) (NP (BASENP (NNS accidents)) (PP (IN at) (BASENP (NN sea))))))))))))) (PERIOD .))