1. A system for simulating interdependencies between multiple critical physical infrastructure models, comprising: a first infrastructure data model that models a first critical physical infrastructure; a second infrastructure data model that models a second critical physical infrastructure, wherein the second critical physical infrastructure is a different critical physical infrastructure from the first critical physical infrastructure; a simulation engine including a visualization application and adapted to automatically produce a change in the second infrastructure data model in response to a change in the first infrastructure data model; and a user interface permitting a user to interact with the simulation engine.