From Big Bang's theory, obvious is that our universe is just a balanced finite system subject to cycles of creation and destruction until at one certain point everything will run out causing an unavoidable permanent death. 

The permanent death could happen in many ways and at any cycle, during our universe or the next one. After a new big bang reboots the universe by wiping everything out or probably even further in the future. 

The only thing certain in our small finite universe is death, everything will stop forever and nothing will ever happen again. 

**Assuming** the universe is in the last cycle, which means there won't be another reboot. Cold and darkness approaches causing everything to die forever...

**Assuming again** outside there one civilization found a habitable universe similar to ours in terms of laws, with the exception of not being limited by space time and energy. This civilization wants to escape our universe to reach the infinite one, how exactly can they? 

From what I believe to know about physics, I can only reach the conclusion of any interaction between multiple universes being impossible. But only in the case everything I said above is right, and the shape of our universe is either Ω0=1 or Ω0<1. Right... ?

But am I wrong?How do they have any minimal above 0 chance to escape?