(S (S (S (NP (BASENP (DT The) (NN loss)) (PP (IN of) (BASENP (NN communication)))) (VP (VBD occurred))) (SBAR (WHADVP (WRB when)) (S (BASENP (DT the) (NN rocket)) (VP (VBD had) (VP (VBN achieved) (NP (BASENP (DT an) (NN altitude)) (PP (IN of) (NP (BASENP (QP (RB around) (NN 70)) (NNS kilometers)) (PRN (LRB -LRB-) (BASENP (NN 43) (NN mi)) (RRB -RRB-)))))))))) (PERIOD .))