Saving a thousand people is without a doubt would be a Herculean task.
Require an enormous amount material supplies and equipment; not to mention planning.
Just the food and water requirements for 3 months would weigh tons.
And then there is the question of transporting everything to the selected site and need for security and all the while keeping it a secret; so that it is not overrun by other survivors.
All in all; I would say the problems are almost impossible to overcome.