The drawings show that a single concealed chamber will sit directly alongside fibre-optic cables transmitting financial data to the City of London, as well as email and messaging traffic for millions of internet users.

Chamber, as in room, right?

The disclosures will reignite fears that Beijing could be seeking to spy on the information carried through the network, potentially gaining access to state and financial secrets.

Wouldn’t it be encrypted? Wouldn’t someone notice if you tried to tap into a fibre optic cable?

Other areas obscured by redactions include emergency back-up generators, a sprinkler plant, new lift shafts and communications cabling. The plans also conceal bathrooms and showers, potentially allowing officials to remain underground for extended periods.

Redacting your emergency backup infrastructure and fire suppression system seems reasonable enough, especially when you’re a world superpower with a lot of enemies