Not at all surprised. In the late 1990s I worked for the UK subsidiary of a large US defence contractor. They had an international network which connected thei

Not at all surprised. In the late 1990s I worked for the UK subsidiary of a large US defence contractor. They had an international network which connected their subsidiaries to transfer documents, emails and engineering drawings. Most work was done for the US DoD. This was a typical leased ISDN system from BT. It had cryptos at each end of a link (each in a literally a 2m by 2m room declared US soil by the then home secretary). The biggest threat vector they had was actually listed as GCHQ and the line would suspiciously go down occasionally for a few ms resulting in the cryptos being "red buttoned" (key erasure). A telling tale if any.