What happened to the National Nuclear Security Administration employees during the Trump administration?

During the Trump administration, hundreds of employees at the National Nuclear Security Administration were abruptly fired, with their terminations made effective immediately. These workers were immediately cut off from their work email accounts and computer systems, leaving them completely disconnected from their jobs. The following day, administration officials apparently regretted this hasty decision and attempted to rehire ('unfire') these employees. However, because they had already severed all digital access, they had no way to contact the very people they now wanted to bring back. This incident exemplifies the chaotic management decisions that potentially compromised nuclear security operations.