(S (S (SBAR (IN Since) (S (BASENP (DT the) (NNP June) (NN 13) (NN video)) (VP (VBD surfaced)))) (COMMA ,) (S (BASENP (JJ other) (NNS videos)) (VP (VBP have) (VP (VBN been) (VP (VP (VBN posted) (PP (TO to) (BASENP (NNP YouTube)))) (S (VP (ADVP (RB allegedly)) (VP (VBG showing) (NP (NP (BASENP (DT some)) (PP (IN of) (BASENP (DT the) (NNPS ROVs)))) (VP (VBG being) (VP (VP (VBN tossed) (ADVP (RB around))) (PP (IN by) (NP (NP (BASENP (JJ large) (NNS amounts)) (PP (IN of) (BASENP (NN oil) (NN seeping)))) (PP (IN through) (BASENP (DT the) (NN seafloor)))))))))))))))) (PERIOD .))