The phrase "almost unimaginable scale" is correct and usable in written English.
It can be used to describe something that is so large or extensive that it is difficult to comprehend.
Example: "The project was undertaken on an almost unimaginable scale, involving thousands of workers and vast resources."
Alternatives: "nearly incomprehensible magnitude" or "virtually unfathomable extent."
This was genocide planned on an almost unimaginable scale.
"It is the banking system that has received financial support on an almost unimaginable scale.
"That journey can be tracked, it can be stored and it can be shared on an almost unimaginable scale".
It documents atrocities committed against people and wildlife, on an almost unimaginable scale, by an ivory trafficking network coordinated by two of Africa's most notorious war criminals.
The answer is simply put: the 20th century, surely the most appallingly violent of them all, scarred by total war, genocide and other mass killings on an almost unimaginable scale.
In the weeks and months following the Dec. 26 tsunami, as the full, almost unimaginable scale of the tragedy became apparent — more than 200,000 dead across Asia, and almost 8,000 here in the southeastern state of Tamil Nadu — I returned again and again to the coast.
"They are building an enormous computing resource on a scale that is almost unimaginable".
Since 1995, Mr. Delay has documented suffering in the Democratic Republic of Congo on a scale that is almost unimaginable.
Thirty square miles are felled daily in a burst of habitat destruction that is taking place on a scale and speed almost unimaginable in the West.
The original Gedächtniskirche was commissioned in the nineteenth century as a memorial of one kind, and as a ruin in the twentieth century it became through violence and circumstance a memorial of another kind, to a scale of loss almost unimaginable even today — to which work of memory the twenty-first-century lives of those who recently died in its shadow are now added.
Because if you live in that way, you can make a difference on a scale that's almost unimaginable.
