I've heard two different things:
1) There are no checkpoints, you'll start from the very beginning each time.
2) There are, but it'll still drop you at the start, and you'll have to redo the key segment in the courtyard to open the door to the challenge you were last stuck on.
Could someone please verify which of these is correct?
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Edited by IMADAJ: 9/14/2017 3:38:50 PMYou will restart at the beginning of the raid. Go to the lever room under the walkway you spawn on and flip then in the correct order. A door opens up top. It's in the front right in line with that starting walkway. There are pipes over a pit. Jump on the pipes and walk in. There is a rather large complex maze here. Hidden chests and shortcuts to other areas of the raid. Lever pull order from left to right 153246 Credit goes to BYF on youtube.