I could have sworn I saw the saucer itself fracture, laterally bisecting the void. Need to watch the crash again to verify. Stay tuned.
I can confirm that the saucer does split across the void having studied the crash scene and watching a lot of behind the scenes for that ...scene...
Go To YouTube and search for ILMVisualFX and there's one with the Vengeance crash as a thumbnail. some nice VFX shots !!