(SINV (SINV (SBAR (RB Only) (SBAR (IN once) (S (BASENP (NN rescue) (NNS workers)) (VP (VBD reached) (NP (BASENP (DT the) (ADJP (RBS hardest) (VBN hit)) (NNS areas)) (PP (IN of) (BASENP (DT the) (NN storm)))))))) (SINV (VBD did) (S (BASENP (PRP they)) (VP (VB begin) (S (VP (TO to) (VP (VB realize) (NP (BASENP (DT the) (NN extent)) (PP (IN of) (NP (BASENP (NN damage)) (SBAR (WHNP (WDT that)) (S (VP (VBD had) (VP (VBN occurred))))))))))))))) (PERIOD .))