(S (S (BASENP (NNP BP)) (VP (VBZ fears) (SBAR (S (NP (BASENP (NN anything)) (ADJP (JJR lower) (PP (IN than) (BASENP (DT the) (VBN expected) (NN PSI))))) (VP (MD could) (VP (VB mean) (NP (NP (BASENP (DT a) (NN leak)) (PP (IN in) (UCP (BASENP (DT the) (NN cap)) (CC or) (ADVP (RB elsewhere))))) (COMMA ,) (PP (IN such) (PP (IN as) (NP (NP (BASENP (NN oil) (CC or) (NN methane)) (NN seeping)) (ADVP (RB up) (PP (IN from) (BASENP (DT the) (NN seafloor)))))))))))))) (PERIOD .))