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Fire prevention
A defence in depth strategy to fire prevention does not focus all the resources only on the prevention of a fire; instead, it also requires the deployment of fire alarms, extinguishers, evacuation plans, mobile rescue and fire-fighting equipment and even nation-wide plans for deploying massive resources to a major blaze
Engineering
Defence in depth may mean engineering which emphasizes redundancy - a system that keeps working when a component fails - over attempts to design components that will not fail in the first place. For example, an aircraft with four engines will be less likely to suffer total engine failure than a single-engined aircraft no matter how much effort goes into making the single engine reliable.
Nuclear engineering
In nuclear engineering and nuclear safety, defence in depth denotes the practice of having multiple, redundant, and independent layers of safety for the single, critical point of failure: the reactor core. The aim is to reduce the risk of harm to individuals or the public at large.
Information security
Likewise, in information security / Information Assurance defence in depth represents the use of multiple computer security techniques to help mitigate the risk of one component of the defence being compromised or circumvented. An example could be anti-virus software installed on individual workstations when there is already virus protection on the firewalls and servers within the same environment. Different security products from multiple vendors may be deployed to defend different potential vectors within the network, helping prevent a shortfall in any one defence leading to a wider failure; also known as a "layered approach".
