All was destroyed, except something intangible yet powerful and indestructible.
But when we watch the ants round their ruined heap, the tenacity, energy, and immense number of the delving insects prove that despite the destruction of the heap, something indestructible, which though intangible is the real strength of the colony, still exists; and similarly, though in Moscow in the month of October there was no government and no churches, shrines, riches, or houses—it was still the Moscow it had been in August.
There are no more uses of "indestructible" in the book.
Show samples from other sources
When the fear takes over, use the only thing more powerful, more indestructible, to fight it: your spirit.
Sabaa Tahir -- An Ember in the Ashes
"Nick, don’t let one good turn make you feel indestructible," Go said.