(S (BASENP (PRP They)) (VP (ADVP (RB also)) (VP (VBD stated) (SBAR (IN that) (S (BASENP (PRP they)) (VP (QT (DQL ``) (VP (VBP have) (VP (VBN continued) (S (VP (TO to) (VP (VB monitor)))))) (DQR '')) (CC and) (QTL (DQL ``) (QTC (VP (VBP have) (VP (ADVP (RB also)) (VP (VP (VBN carried) (PRT (RP out))) (BASENP (JJ seismic) (NNS surveys))))) (PERIOD .)))))))))