(S (S (BASENP (NN Gas) (CC and) (NN oil)) (VP (VP (VBD started) (S (VP (VBG leaking) (PP (IN from) (NP (BASENP (DT a) (NN hole)) (PP (IN beneath) (BASENP (DT the) (NN sea) (NN floor)))))))) (PP (IN on) (BASENP (JJ early) (NNP Friday))))) (PERIOD .))