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A listener note, this episode contains references to suicide and may not be suitable for younger audiences.

It's late at night in mid-March 1996.

Several miles outside Lincoln, Montana, two men creep through a forest.

Their boots crunch on the snow and leaves, and their breath rises in clouds.

One of the men stops and squints at the trees ahead.

A man's name is Max Nol, and even though he's dressed in camouflage, he's not looking for deer.

He and the other man are FBI agents, and right now they're searching for something else, tripwires, booby traps, anything that could lead to an explosion.

Nol scans the forest. It's nearly pitch black.

Their only help is the pale moonlight that breaks through the trees.

Still, from what he can see, nothing stands out.

So Nol turns to the other agent, and the two exchange nods.

They continue creeping through the snow.

Soon they stop next to a tall pine tree.

From here, Nol can see a small wooden structure, about 100 yards away.

He exhales deeply. The cabin belongs to Ted Kaczynski, the man they suspect to be the unibomber.

Nol quickly scans the tall tree.

Then he turns to his partner, and gives a thumbs up.

This is where they'll set up the microphone and motion sensor.

These tools will give them unparalleled access to Kaczynski, and that's something they need right now.

Because for the past week, the FBI hasn't made enough progress.

They've been spying on Kaczynski, but they've been staying far away, and the trees of the forest

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