It did happen at a single location, but since every thing in the universe was also at that location everything in the universe was in the big bang so the “debris from the explosion” is everywhere at once so from the point of view of the debris there is no single point of origin. In theory if you were to step outside the universe and able to observe it (how this would happen regarding speed of light is impossible to say) there would be a single location where it could be said to be spreading out from.
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