Yes, and no. We know from Einstein and others that higher dimensions do exist. An advanced civilization probably cracked how to make use of interdimensional travel. Understanding the 4th dimension would mean you could see or somehow sense it. There are 4 dimensional line drawings out there. The trouble is, unless someone tells you what you're looking at, you wouldn't recognize it as such. That means, you could pass by 4 dimensional occurrences daily in nature, and you wouldn't know it. Our brains are not developed to detect the 4th dimension with the senses we're aware of. We may have other senses we're unaware of that could let us detect the 4th dimension. For example, it could be that what we call our imagination is one of those senses. However, unless you know what you're looking for, it still would be impossible to recognize a 4th dimensional event. Consequently it's possible that 4 dimensional visitors from another galaxy could be in our immediate vicinity, and you wouldn't see them. A bug that lives in a 2 dimensional world, usually doesn't know when we're approaching it. It is incapable of recognizing a 3 dimensional entity. Some have a chemical sensory system. They navigate by following chemical paths to find stuff, or each other. They don't rely on vision, like us. Looking at this example, there must be another way to 'see' the 4th dimension, one we don't recognize as such. Why do I go through this lengthy thought experiment, if you can call it that? I think we could be infiltrated by visitors from other galaxies right now. They're aware of us, but we're not aware of them. That would explain a lot, like why some people claim they can see ghosts, or supernatural events. We have not reached the evolutionary level where the 4th dimension is something we can grasp. If this is true, our problem to overcome long distance space travel isn't just technological, it's also evolutionary. We know enough to understand that we don't understand how to travel to Andromeda within a lifetime. That's a step in the right direction. I doubt the problem can be solved with the development of a warp drive. The Milky Way alone is almost 106,000 lys across. Andromeda is 2.5M lys away. We'll never get there, even with a warp drive. Of course, a warp drive is better than our rocket drives. But, we'd have to develop our abilities far beyond warp drive technology to physically travel to another galaxy. Our understanding of how the universe works would have to advance by 100s, or perhaps 1000s of years to get anywhere near the capability to travel across millions of light-years with a human lifespan. Another possibility is that physical space travel may be obsolete. That subject has been explored in movies like Contact, or Avatar. The idea that we're connected to an avatar like being, aka an astral body, has been out there for a long time. Presumably, these exist in an environment beyond our grasp, such as the 5th dimension, as depicted in the movie Interstellar. The reality of higher dimension is probably very different than what is imagined by 3 dimensional humans. But it certainly would revolutionize travel within our universe. That seems borderline insane right now. However, until 100 years ago we didn't know that some of those light specks we see in the night sky are actually galaxies. Until then we had no idea how vast the universe is. We thought the universe is made of 1 galaxy, the Milky Way, and that's it. This is a similar breakthrough as when we realized Earth is spherical. Until then, we believed beyond the horizon is the end of our world. In retrospect it's obviously logical that Earth is spherical. However, without evidence we assumed many alternative theories. It's the same with higher dimensions. Once we understand how they work, we're probably assuming the wrong theories. Then again, one of them could be correct.