(S (S (BASENP (NNP Oleg) (NNP Mitvol)) (VP (VBD said) (SBAR (IN that) (S (SBAR (IN although) (S (BASENP (DT the) (NN sulfur) (NN spill)) (VP (VP (VBZ does) (RB n't)) (VP (VB present) (BASENP (DT an) (JJ environmental) (NN danger)))))) (COMMA ,) (S (BASENP (DT the) (NN two) (NNS freighters)) (VP (MD might) (VP (ADVP (RB also)) (VP (VP (VP (VB leak) (BASENP (NN fuel) (NN oil))) (PP (IN from) (BASENP (PRPD their) (NNS tanks)))) (COMMA ,) (S (VP (VBG adding) (PP (TO to) (BASENP (DT the) (NN pollution))))))))))))) (PERIOD .))