(S (S (NP (QP (ADVP (RB Up) (TO to)) (NN 539)) (BASENP (NN oil) (NNS workers))) (VP (VBP are) (VP (VBG being) (VP (VP (VBN moved) (PP (IN off) (BASENP (DT the) (VBN affected) (NN rig)))) (PP (IN in) (NP (BASENP (DT an) (NN operation)) (SBAR (WHNP (WDT that)) (S (VP (VP (VBD began) (PP (IN at) (NP (BASENP (NN 09:20)) (BASENP (NN UTC))))) (BASENP (DT this) (NN morning))))))))))) (PERIOD .))