How to unlock the garage in Imandra?

Do not see a mission like for Zim to establish it or like pedro bay

you will need to complete the task "Broken power station" once you completed that task on the power station site will spawn one new task called "Repairing power lines" on the description of that new task you can see that if completed the task one of the rewards is the "access to the location" in that case the garage.
So in summary complet "broken power station" task and after "repairing power lines" and done you can access to the garage.

Actually, these two tasks should run as contracts like the sawmill in "Island Lake" or the garage in "Zimnegorsk".

didnt know there was a garage lol ill have to do this would make my life much easier