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There are very few ways they could, they could find a teleporter but even if that happened they would need some kind of space vehicle because remember the Micro-Dyson sphear they are trapped in is in slipspace and other than lack of O2 the transison from slipspace to normal space would tear there bodys to shreads. So they would need a ship , now if there are forunner ships inside the sheild world like on halo wars then there is a possability but other than that there is not really a chance for them to get away. Hope this helps.

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