Bletchley Park, the top-secret home of the Second World War codebreakers, is hosting a brand-new exhibition when it reopens next week.
As part of COVID restrictions easing, the site will reopen on 17 May for the first time since December and with it a new addition, which offers more details of the story behind what was once the world's best-kept secret.
During World War Two, Bletchley Park in Buckinghamshire was where British codebreakers worked to thwart Nazi Germany through breaking coded messages.
Now, the team at the museum has not only been able to identify and name every one of the codebreakers but also their teams and even the room they were working in.
It also explains why Bletchley Park was chosen.
Exhibition manager Erica Munro said: "Previously 'how did it all begin?' is something we've not had the chance to say in the past, it's something we've been able to allude to.
"In recent years we've never had the opportunity for visitors to go into an exhibition gallery and really get into the nitty-gritty detail of why Bletchley Park was chosen and where did it all begin."
The exhibition is split into five sections in the drawing room of the historic mansion – one of the first rooms used by the codebreakers in the autumn of 1939.
The display aims to give visitors a real sense of what was happening as war broke out.
Ms Munro described it as "'unbelievable".
"We have furniture around the exhibition space, where we have been able to install showcases to show replica and real documents from that time which are quite a rarity to come across," Ms Munro said.
"We've been able to 'embed' them into the furniture, and set-dressed it to feel as if they are really there in those offices from that time.
"We are asking our visitors to really think and get into the shoes and the brains of some of the people who had to make decisions here," she added.