After humanity achieved a new technology in the construction of spaceships, they were able to find the way to the farthest parts of the galaxy and live there... This is one of the examples of high-tech ships there.

In the far far from our galaxy there is another galaxy... a different world with different structures and spaceships
There is a world between the sky and sea...spaceships can fly and swim. there is no limitation between them only a very slim skin acts as a border...u can go from one place to another in the blink of an eye.
Spaceships break this boundary and go wherever and whenever they want.

All this happened after a huge scientific revolution and human was able to achieve the technology of traveling in the galaxy and far away.
As you know, there is always a need for an energy source and there is a planet full of new energy in this galaxy where all the ships are coming to replenish energy.