Baby swallow

Today I found three baby swallows that had come out of the nest in the high roof of the stable. Exactly the same best where I had a similar incident last year. Two babies were alive one was sadly dead. I can’t reach the high nest to put them back so I’ve put the babies on a lower ledge near to the nest on some sawdust. One over has now sadly died but the other is still alive. Is there anything else I can do to save the final swallow?