What was there when there was nothing?

Before knowing this, it has to be known that, does the state of nothing ever come? Or something remains. Is there always something left? If so what is that something?

Ancient Philosophy:

When this universe did not exist, then at first ‘atma’ or ‘soul’ merely existed. There was not even a flicker. Soul viewed and reflected, perceived all in detail in the thought process as to how to create various features of creation.

 – Aitareya Upanishad 1.1.1

Nothing happens until something moves
Start your journey to find or explore the secret of nothing with ancient science.
What is nothing? And what is the mystery of nothing? In order to know this, See the next post and keep exploring further.