This T-shirt features the graphic used in the "Protect and Survive" booklet* issued during the Cold War, telling us how to best prepare for a nuclear attack:
KNOW THE WARNING SIGNS
THE ATTACK WARNING - When an air attack is expected the sirens will sound a raisng and falling note.
THE FALL-OUT WARNING - When there is danger from fall-out you will hear three loud bangs or three whistles in quick succession.
THE ALL-CLEAR - When the immediate danger from both air attack and fall-out has passed, the sirens will sound a steady note.
*A facsimile of this booklet is available from this shop: code BK0804