(S (S (BASENP (PRP They)) (VP (VP (VP (VP (VBD went) (BASENP (NN 25) (NNS feet))) (PP (IN into) (BASENP (DT the) (NN pipeline)))) (CC and) (VP (VP (VBD took) (PP (IN with) (BASENP (PRP them)))) (NP (NP (BASENP (NN two) (NNS barrels)) (PP (VBN filled) (PP (IN with) (BASENP (NN cement))))) (COMMA ,) (VP (VBG weighing) (NP (BASENP (NN 600) (NNS pounds)) (BASENP (DT each))))))) (CC and) (VP (VP (VP (VBD locked) (BASENP (PRP themselves))) (PRT (RP in))) (PP (IN between) (BASENP (PRP them)))))) (PERIOD .))