i was recently replaying A Step Between Stars and found a hole in the map during the Spacewalk area, the first time it happened i was confused and respawned
but i was able to recreate what happened and got these shots of me out of the map area
https://dl.dropboxusercontent.com/u/94606267/screenshot_2015-02-11-18-56-12.jpghttps://dl.dropboxusercontent.com/u/94606267/screenshot_2015-02-11-18-56-43.jpg
the hole was found around and near one of the interaction points that you use to enter the second half of the mission area after the spacewalk
pictured here:
https://dl.dropboxusercontent.com/u/94606267/screenshot_2015-02-11-19-05-00.jpg
the approximate area where you will fall into the hole is circled in green