Caleb checked his watch.
‘There’s less than five minutes left on the countdown.’
They were far along the tunnel, the entrance just a glimmer of light behind them, the size of a coin. On their left was an opening to a bay filled with trucks parked in long lines.
‘This way,’ said Sara, weaving through the gaps between the vehicles until she stood at the rear of a particular truck in the middle of the space.
She pulled down the tailgate and leaped up on to it, pulling the tarpaulin aside to expose the contents of the flatbed.
‘Holy shit,’ breathed Caleb. ‘Is that a bomb?’
Sara walked down the length of the truck to a briefcase lying next to the rods, on which a timer counted down.
‘Can you defuse it?’ asked Caleb.
Sara shook her head. ‘No, this thing is going to blow. There’s no way to stop it.’
Caleb looked at her uncertainly, waiting for her to complete the sentence, to add the caveat that she knew what to do. But she didn’t respond, instead kneeling down and picking up a crowbar lying next to the briefcase. She walked back towards him and jumped off the end of the truck.
‘Why did we come here?’ asked Caleb.
‘For this,’ said Sara, waving the crowbar and setting off back towards the main tunnel. ‘Now we need to get to the computer room. It’s one floor above us.’