(S (S (NP (BASENP (DT The) (JJ first) (NN indication)) (PP (IN of) (BASENP (DT the) (NNP Piccadilly) (NN line) (NN bomb)))) (VP (VBD was) (SBAR (SBAR (WHADVP (WRB when)) (S (BASENP (DT the) (NN tunnel) (NN telephone) (NN system) (NNS wires)) (VP (VBD were) (VP (VBN cut) (PP (IN by) (BASENP (DT the) (NN blast))))))) (COMMA ,) (NP (BASENP (DT an) (NN event)) (VP (VBN logged) (PP (IN by) (BASENP (JJ other) (NN software)))))))) (PERIOD .))