Here's what we know:
* Lazar's story first emerged in 1989, in an interview with a local Las Vegas television station. He claimed to have worked at Sector 4 from 1988 to 1989, where he helped reverse-engineer a flying disc powered by a "element 115" reactor.
* The U.S. government and Area 51 officials have never acknowledged Lazar's claims. They have repeatedly denied the existence of Sector 4 or any alien technology programs at Area 51.
* Independent investigations have failed to verify Lazar's story. No corroborating evidence has been found to support his claims.
* Lazar's background and credentials have been questioned. He claims to have earned degrees from prestigious institutions, but these claims have been disputed, and no official records exist to support them.
* Lazar's story has been widely criticized by scientists and researchers. Many experts have pointed out flaws and inconsistencies in his explanations of alien technology and element 115.
Therefore, it is highly unlikely that Bob Lazar ever worked at Sector 4 or had any involvement with alien technology at Area 51. While his story is intriguing and has captivated many, it lacks credible evidence and should be treated with extreme skepticism.