In this regard, it is similar to continuing reports in the media that inform us of astronomers search for answers to questions about how and when the universe began. The emergence of something from nothing, or its reverse, belongs in the realm of magic, not science. There may well have been a Big Bang or several Big Bangs, in the universe's boundless history, but prior to each the universe logically had to exist in some form.
All actions are the actions of entities, of things that exist.
By definition, there is nothing more basic than existence, nothing prior to it. The universe, with its inherent dynamism, has in some form always existed, and in some form always will. A search for a cause outside of the universe, i.e., outside of existence, is a search for a cause from nowhere. Ultimately, a search for causation is a search for identity. The elements of existence interact as they do because of what they are.