MIA Operatorsis a unique mechanic inRainbow Six Extractionwhich introduces an element of risk reward.
Failing to rescue them will still see them return to you - albeit with a few penalties.
How does the MIA Operator mechanic work in Rainbow Six Extraction?
This renders them unavailable to play as for future missions until they are rescued.
To rescue a MIA Operator, you must return to the level they fell.
Within that Hot-Zone will be an Archaean Tree, where the Operator will be located.
You know you are in the right place where you might hear a beeping closeby.
When ready, approach the Tree and interact.
Start by pulling the Operator, and have either yourself or another player look at the branches.
These will temporarily stop pulses which travel along the branches and slow the rescue.
With the pulses clear, return to the tree and pull the Operator to continue the rescue.
From there, you will be carrying the Operator, and have to go to an extraction point.
Load them into the pod at the extraction point to complete the rescue.
Whether you leave here, or decide to continue to the next Hot-Zone, is up to you.