(S (S (PP (VBG According) (PP (TO to) (BASENP (DT this) (NN report)))) (S (NP (BASENP (DT the) (NNS drills)) (PRN (COLON --) (SBAR (WHNP (WDT which)) (S (VP (VBD began) (PP (IN on) (BASENP (NNP Friday)))))) (COLON --))) (VP (VBP are) (S (VP (TO to) (VP (VB be) (VP (VBN conducted) (PP (IN over) (NP (NP (BASENP (QP (RB roughly) (PDT half) (DT a) (NN million)) (NN square) (NNS miles)) (PRN (LRB -LRB-) (BASENP (QP (DT a) (NN million)) (NN square) (NNS kilometers)) (RRB -RRB-))) (PP (IN of) (NP (BASENP (NNS waters)) (VP (VBG stretching) (PP (PP (IN from) (NP (BASENP (DT the) (NNP Strait)) (PP (IN of) (BASENP (NNP Hormuz))))) (PP (TO to) (NP (NP (BASENP (DT the) (JJ northern) (NN part)) (PP (IN of) (BASENP (DT the) (NNP Indian) (NNP Ocean)))) (SBAR (WHNP (WDT which)) (S (VP (VBZ includes) (NP (BASENP (DT the) (NNP Gulf)) (PP (IN of) (BASENP (NNP Oman)))))))))))))))))))))) (PERIOD .))