(S (S (PP (IN For) (BASENP (DT the) (JJ past) (NN two) (NNS days))) (COMMA ,) (S (BASENP (NNP ROV) (NNS cameras)) (VP (VBD showed) (NP (BASENP (NNS bubbles)) (VP (VBG coming) (PP (IN from) (NP (BASENP (DT the) (NN base)) (PP (IN of) (BASENP (NN well)))))))))) (PERIOD .))