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This paper is the third in a series investigating the possibility that if wereside in an inflationary "bubble universe", we might observe the effects ofcollisions with other such bubbles. Here, we study the interior structure of abubble collision spacetime, focusing on the issue of where observers canreside. Numerical simulations indicate that if the inter-bubble domain wallaccelerates away, infinite spacelike surfaces of homogeneity develop to thefuture of the collision; this strongly suggests that observers can havecollisions to their past, and previous results then imply that this is verylikely. However, for observers at nearly all locations, the restoration ofhomogeneity relegates any observable effects to a vanishingly small region onthe sky. We find that bubble collisions may also play an important role indefining measures in inflation: a potentially infinite relative volume factorarises between two bubble types depending on the sign of the acceleration ofthe domain wall between them; this may in turn correlate with observables suchas the scale or type of inflation.

Surviving the crash: assessing the aftermath of cosmic bubble collisions