An exhibition celebrating the work that went on in Winston Churchill's wartime bunker has opened in Whitehall in London.
Seventy years ago this week, the famous war rooms became operational. It was the week before Germany invaded Poland. Britain was yet to declare war.
The typists, secretaries and telephonists in Churchill's underground bunker were among the forgotten heroes of World War II.
Women like Myra Collyer helped to plan every step of the war against Nazi Germany.
"It was 75 pence a week wages, I remember that, and we couldn't do much on that," she said.
"I don't know, we got two pounds 10 shillings," said another former secretary.
"Oh I didn't, how did you get that?" said Ms Collyer laughing.
Joy Hunter was part of the secretarial pool.
"A group of us were taken down and brought down here with the onset of D-Day to do the more intricate planning," she said.
"We typed [the instructions]. We knew the date of D-Day, we knew the movements of troops in England. We knew exactly which ports they were going to go from and how they were going to go.
"We had reports every single day where the bombs had fallen in the whole country. So we were very much in the heart of it."
The new exhibition displays everything from the bunker's chemical toilets to the sun lamps brought in to help the staff cope with weeks stuck underground with no daylight.
Four of Churchill's most powerful speeches were drafted in his bunker, and his notes from them are on display for the first time.
The director of the Churchill Museum and Cabinet War Rooms, Phil Reed, says the former leader's wife was critical to the entire war effort in terms of keeping her husband in check.
"There's a great letter we've got on display in the Churchill Museum, written in 1940, and she was put up to it by Churchill's staff," he said.
"She writes to him to say your people, you're mistreating them, this is not the man I know and love, I think you should go easy on them. And she was the only one that anybody thought could ever get close to make that point to him.
"When you look inside the cabinet room and you see Churchill's seat and surrounded by his most senior ministers - his heads of intelligence, his heads of the army, navy and air force, even occasionally heads of state from places like Australia, who were contributing to cabinet meetings on a regular basis - it's the one place that if the Nazis had wanted to bomb, they should have done. But they never did."
The rest of the most significant buildings in Whitehall were bombed during the war.
The House of Commons was razed, and the treasury building, cabinet office and Buckingham Palace were all hit.
People thought they were safe in the bunker. But a letter made public in this exhibition reveals that it was not actually bomb-proof.