The First Thing is the first thing to ever exist.
Some modern theoretical physicist believe the universe can and will create itself from nothing. This is due to the nature of the laws of physics.
We already concluded there is no explanation for where these fundamental laws have come from.
So your premise that the universe can not be explained is flawed.
It can be explained by using the laws of physics.
what can not be explained is where these laws came from.
There may or may not be a answer. Maybe the answer resides in another universe, Or maybe the laws are self existent.
Your right if you mean to say that no one can explain where the laws of physics came from. But the universe's existence is a direct result of the Big Bang. That has pretty much become the most accepted theory to date.
Frozen Accidents: Can the Laws of Physics be Explained? | NOVA | PBS
Edited by 1.61803, : link and meme
"You were not there for the beginning. You will not be there for the end. Your knowledge of what is going on can only be superficial and relative" William S. Burroughs