(S (S (SBAR (IN While) (S (BASENP (DT the) (NN risk)) (VP (VP (VBZ is) (ADJP (JJ slim))) (SBAR (IN that) (S (BASENP (DT the) (NN oil) (NN slick)) (VP (MD will) (VP (VP (VB move) (PP (IN up) (BASENP (DT the) (NN seaboard)))) (ADVP (RB enough) (S (VP (TO to) (VP (VB get) (PP (IN into) (BASENP (JJ Canadian) (NNS waters)))))))))))))) (COMMA ,) (S (BASENP (PRP it)) (VP (VBZ is) (ADJP (JJ possible))))) (PERIOD .))