It is the home of secret missions and risky espionage, but even MI5 needs a health and safety manager to keep its staff free from danger.
The UK's Secret Service is recruiting for the £60,000 role to ensure it carries out its operational activity "as safely as possible".
To protect national security, applicants will be told nothing about where they will be working, who with, or with what technology. Possible candidates are even warned that they will be told little about the job they are applying for.
The advert on the MI5 website says: "We can't show you the buildings. We can't talk about the people you'll work with. We can't tell you much about the job.
"We can't give you the exact locations. We can't mention the kind of technology involved. Is it still a risk worth taking?"
The description reveals only that the job is "London based with some UK travel".
Highlighting the challenges of working for the Secret Service, it adds: "What we can tell you is that whatever your role at MI5 you'll be contributing to protecting the UK from threats to national security including terrorism and espionage.
"Like other large organisations, at MI5 we use a variety of equipment to carry out our work, except here our work is often covert and our equipment classified."
Applicants will have to get through a number of vetting stages before being accepted for the role.
MI5 is also recruiting for two health and safety advisers.