filming the teeming life on the reefs 
(ROOT (S (VP (VBG filming) (NP (NP (DT the) (VBG teeming) (NN life)) (PP (IN on) (NP (DT the) (NNS reefs)))))))
(ROOT (S (VP (VBG ) (NP (NP (DT ) (VBG ) (NN )) (PP (IN ) (NP (DT ) (NNS )))))))