Light speed

The speed of light - 299,792,458 metres per second - is the universe's ultimate speed limit. No matter how hard we try, nothing with mass can reach or exceed it. As an object moves faster, it gains mass, requiring more energy to accelerate, and at lightspeed, that energy becomes infinite.
This is why faster-than-light travel, at least in the conventional sense, is impossible. Even light itself doesn’t break this rule, it just happens to be massless, so it gets a free pass.
However, Einstein’s theory of relativity does offer a loophole - wormholes. If they exist, they could act as shortcuts through space-time, allowing us to "cheat" our way across the universe without technically breaking the speed limit.
So, unless we stumble upon a convenient cosmic backdoor, we're stuck crawling through space at a snail’s pace. Cheers, physics.

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One possible exception to this law, it's called a muon, this is a sub atomic particle, it weighs in at just above an electron, so it's got some mass to it, thus it creates what is called the muon paradox, what this is when a muon is created high in Earths upper atmosphere by cosmic rays colliding with other atomic partical's, this collision causes lots of other types of subatomic partical's to be created, one of these is a muon, the paradox is that a muons life span is only 1.56 microseconds, this life span is not long enough to reach the surface of the Earth from where they are being created, but they are detected as doing so.

So the only way a muon can be detected at and below the Earths surface is that it must travel faster then the speed of light.

These muons have been used to look deep inside the great pyramid in Egypt using new developed muon detectors, this helped in the discovery of a very large undiscovered void inside.