Worth A Try
It felt unnatural for the firemen to be putting the cubs back into the drain from which they had been rescued. Nevertheless, it was important for their mother to have the opportunity to find them and take them back. Although this time the firemen would be watching over them.
Patience
After they had replaced all the cubs back in the hole, the rescuers had to wait patiently nearby. The last thing they wanted was the mother to get spooked. A little distance and no interference would do the trick. The vet had explained that she might be waiting until it was dark to come back for her babies.