Board Thread:Warhammer 40k General Discussion/@comment-24.177.35.35-20130913034201/@comment-2.221.112.151-20130917212547

The version i read was that the Tau discovered a old wrecked ship on their moon (rather convenient i suspect Eldar treachery). From this they reverse engineered a "warp dive" engine that allows them to skim the surface of the warp, like a bubble held under water that shoots out at immense speed. This was approximately 5 times slower then Imperial Warp travel, but given the compact nature of their empire was not a big problem.