brought to you by Aspire Mungfront on ITVX, a six-part drama of friendship and betrayal,

starring Damien Lewis and Guy Pierce. The coldest war is within. Aspire Mungfront,

stream free on ITVX.

Welcome to True Spies. Week by week, mission by mission. You'll hear the true stories

behind the world's greatest espionage operations. You'll meet the people who navigate this secret world.

What do they know? What are their skills? And what would you do in their position?

This is True Spies. Some of this needs to remain sensitive for a lot of reasons.

Let me just kind of filter this. There really could be people whose lives are still at risk

because of the job they're doing today. This is True Spies.

Episode 84. The Moonlight Maze.

Some missions are never truly accomplished.

We really should have had our defenses raised prior, but again this was the first,

the first advanced persistent threat to do this kind of operation.

Meet Bob Gawley, a former director of intelligence at the Department of Defence.

The overall view of the Department of Defence was quickly becoming,

this is a hostile nation, state espionage operation.

It's 1999 and Bob has the dubious honour of investigating what many consider

to be the very first case of large-scale, international cyber espionage.

It's a massive interagency operation to hunt down those responsible

for the theft of an incomprehensible amount of sensitive information.

Scientific and technical information, some of it extremely detailed about our weapon systems,

our sensors, our programs and our scientific research.

...