Transwarp threshold

The transwarp threshold (also known as the maximum warp barrier or the transwarp barrier) was a boundary that separated warp from transwarp and was identified in the 24th century as the velocity of warp 10.

In 2372, Tom Paris became the first Human to cross the transwarp threshold. While the attempt was successful, the Federation transwarp drive turned out to be an unsafe method of bringing USS Voyager back to the Alpha Quadrant, as it induced hyper-evolution in Humans.