Saved but Lost Every Thing?

i was working on a video and auto save is on ... it had just said it saved and then not to long after it crashed ... i reopened it and every thing was gone .... am i missing something .... if some one could help me with getting my stuff back that would be grate cuz it was almost done and i dont think i could make the video as good as it was before the crash... so how would u recover something from a crash that has made every thing disappear ...