I fail to see how the failure of the containment field inside the reaction chamber would cause a shipwide explosion. The antimatter within the reaction chamber is, after all, 100% annihilated anyways, and the reaction chamber is built to withstand that energy.
The only thing that would destroy the entire ship would be a failure in the containment field in the antimatter storage containers. Makes sense with the dialogue in Contagion. The containment field in the storage chambers failed. So all of the antimatter at once got in touch with the matter (a bulkhead, or the metal wall of the chamber) surrounding it.
The only thing that would destroy the entire ship would be a failure in the containment field in the antimatter storage containers. Makes sense with the dialogue in Contagion. The containment field in the storage chambers failed. So all of the antimatter at once got in touch with the matter (a bulkhead, or the metal wall of the chamber) surrounding it.