from ZeroHedge:
Update (0954ET):
German newspaper Der Spiegel reported that German security officials believe “highly effective explosive devices” were used to blow up the Nord Stream pipelines in the Baltic Sea.
According to SPIEGEL information, it was calculated that explosive devices with an effect comparable to that of 500 kilograms of TNT must have been used to destroy the tubes. The seismic signals registered by various measuring stations were also included in the estimate.