A lockdown-class blast door (LCBD) is a blast door that is designed to reliably close during a lockdown no matter what obstructions are in its way. This is usually accomplished by linear motors capable of crushing bones and metal alike, sometimes combined with a sharp or serrated metal edge, and/or cleaving forcefields. Because it only minimises and doesn’t eliminate risk, Raven takes a different approach at its sector firebreaks, where it utilises blast doors in an airlock configuration where at least one door remains closed and locked at all times.