According to cosmologist and author David Sereda, 3I Atlas is a hyperdimensional craft sent from Nibiru to activate 5D or higher in our 3D solar system. Nibiru itself is a hyperdimensional body with an orbit of some 3620 years. It is the Destroyer which may be trailing 3I Atlas as evidenced by their similar orbits.

Sereda says that 3I Atlas is communicating with us via mathematics which also coincides with important religious dates and festivals. It is through this mathematics that Sereda has constructed our hyperdimensinal solar system which runs parallel and invisible to our physical solar system. Both systems have 9 major planets(see diagram below).

These hyperdimensional planets also correspond to our higher chakra centers which 3I atlas is trying to awaken in us. It will do this by opening up a portal from our 3D physical solar system to the hyperdimensional 5D or higher solar system.

In short Sereda says that 3I Atlas is instrumental in activating the ascension process by reconnecting us to our spiritual planet/chakra centers. David Sereda(and Kerry Cassidy) explain all this in more detail in their video on Nino's Corner, the link of which is...
https://www.youtube.com/watch?v=rb64Q_nwC6U

Personal Notes: Sereda estimates 3I Atlas is some 29 miles in diameter which is the size of a large city. Montreal island, for example, is roughly 33 miles long and 15 miles wide with a population of about 2 million people, so it would be possible for 3I Atlas to have this many people on it provided they are roughly the same size/height as us. Personally, I believe most of the crew on 3I Atlas and/or Nibiru are Anunnaki who are larger than us. Why are they coming? Probably to harvest what they believe is theirs.

In the book Inanna Returns by V. S. Ferguson, she describes the Annunaki from Nibiru returning to Earth for our gold and our women after a long and lonely journey through space. This isn't good news and is where I differ from most New Agers who say that 3I and whatever comes next is a positive event. Humans need to awaken to their incredible potential and throw off their dependence on the "gods" most of whom only want to enslave us. They enslave us through our governments which are Anunnaki institutions.

Ferguson also says that Marduk's rule over Earth came to an end in 2012 in preparation for the New Age(of Aquarius), but his minions may still be in charge. Marduk is Enki's son and Anu's grandson. He is Anunnaki reptilian and has ruled over Earth and Nibiru by force for roughly the last 2000 years. His modern headquarters was in Manhattan, New York and his agenda was war and chaos and media control to continue to keep humanity enslaved. His exit from power has left humanity in limbo which is why there is so much chaos now. A new and better ruler needs to emerge. Trump has tried to pick up the pieces starting in 2016 but appears to be floundering. Who will end up being the next real ruler of Earth?