It seems that, should you ever achieve warp speed in a Star ship, you will die. It is all down to an intense beam of hydrogen gas. I think. According to the NS
The fatal dose of radiation for a human is 6 sieverts. Edelstein's calculations show that the crew would receive a radiation dose of more than 10,000 sieverts within a second. Intense radiation would also weaken the structure of the spacecraft and damage its electronic instruments.
This is like standing in the LHC when it finally gets to working at full power.
Edelstein presented his results on Saturday at the American Physical Society meeting in Washington DC.