3.9 Antimatter Containment Failure
A failure of the magnetic fields isolating the antimatter fuel could destroy the ship, so backup systems guard against it, and if it occurs the fuel can be vented into space and the antimatter storage pods ejected through a hatch at the bottom of the Engineering Hull.
Equally dangerous as a warp core breach, this indicates a failure in the magnetic containment fields which isolate the volatile antimatter fuel from the rest of the ship. Should even a tiny quantity of antimatter come into contact with the "normal" matter in Voyager, the resulting explosion could very easily destroy the ship. Many backup power supplies and magnetic field generators exist to insure that such an accident never happens, but it is remotely possible. If such an accident occurs, the antimatter fuel supply can be vented into space. Emergency shutdown of the warp engine would be performed, and forcefields would attempt to contain the extent of any antimatter annihilation explosions. In a severe accident, explosive bolts would blow another hatch on the bottom of the Engineering Hull and the antimatter storage pods would be ejected. (This is one reason why antimatter storage is located at the bottom of the Engineering Hull.) This procedure is somewhat similar to procedures invoked during a warp core breach.