(S (S (S (BASENP (DT The) (NN tanker)) (VP (VP (VBD spilled) (NP (NP (QP (ADVP (IN at) (JJS least)) (NN 560,000)) (NNS gallons)) (PP (IN of) (BASENP (NN fuel))))) (PP (IN into) (NP (BASENP (DT a) (NN strait)) (SBAR (WHNP (WDT which)) (S (VP (VBZ leads) (PP (TO to) (BASENP (DT the) (NNP Black) (NNP Sea)))))))))) (CONJP (COMMA ,) (CC and)) (S (BASENP (NNS officials)) (VP (VBP say) (SBAR (S (BASENP (PRP it)) (VP (MD may) (VP (VP (VB take) (BASENP (NNS years))) (S (VP (TO to) (VP (VB clean) (PRT (RP up)))))))))))) (PERIOD .))