Imagine if a terrorist got into this. They could cripple the UK,(reply>), Not necessarily a bomb. If some terrorist managed to devise a way to have some long lasting effect to the grid, the UK would get royally screwed over,(reply>), +Andrew Sang A bomb in the tunnels? The tunnels might survive, those concrete segments are serious sized and have solid ground behind them.<br><br>London would loose power for maybe a few hours. All important services would fall over to failovers. Then certain regions would be powered up, perhaps on a rotating schedule, using the limited available infrastructure. Within a few days cables would be repaired (or replaced by an overground stop gap if necessary).