(S (S (BASENP (DT A) (NN rescue) (NN worker)) (VP (VBD suggested) (SBAR (IN that) (S (S (NP (EX there)) (VP (VBD had) (VP (VP (VBN been) (BASENP (JJ heavy) (NN rain))) (PP (IN around) (BASENP (NN 10) (NN a.m.)))))) (COMMA ,) (SBAR (WHADVP (WRB when)) (S (BASENP (DT the) (NN ferry)) (VP (VP (VBD struck) (BASENP (DT a) (JJ strong) (NN wave))) (CC and) (VP (VBD sank))))))))) (PERIOD .))