'Making a whole human genome from scratch would be a gargantuan feat.'

First created during the Cold War, Project Iceworm saw the US plan to store hundreds of ballistic missiles in a system of tunnels dubbed 'Camp Century'.

The drills are to 'check the readiness' of military personnel, weapons and equipment.

An explosion lights up the sky over Kyiv during a Russian drone and missile strike (Picture: Reuters)

The single letter has become one of the most iconic symbols in the world.