Items are now housed in a temperature and humidity-controlled strong-room protected by an inertgas fire protection system, which would douse the room in gas to kill flames instead of using water.
This might some as something of a surprise to those who are invested in the war against drugs but the inertgas helium actually causes more deaths each year in the UK than cannabis, ecstasy and mephedrone put together.
Used fuel that has been cooled in a spent fuel pool for at least five years can be put into a container called a cask and surrounded with inertgas, providing leak-tight containment, according to the U.S. Nuclear Regulatory Commission.