(S (S (S (S (NP (EX There)) (VP (VBD were) (NP (BASENP (NN 79) (NNS people)) (PP (IN aboard) (BASENP (DT the) (NN boat)))))) (SBAR (WHADVP (WRB when)) (S (BASENP (PRP it)) (VP (VBD sank) (PP (IN in) (BASENP (DT the) (NNP Irrawaddy) (NN river))))))) (COMMA ,) (PP (VBG according) (PP (TO to) (BASENP (DT an) (JJ unnamed) (NN official))))) (PERIOD .))