Stumbled upon this while messing around waiting for a splicer door to recharge, and thought it might be something cool for people to try. Step 1: Go to Archon's Keep, Site 6 Step 2: Left of the splicer door, there is a hanging light. Jump onto it. Step 3: To your right, there is a gap in the roof, jump through it. Congratulations, you are out of the map. Have fun :)