It wouldn’t be hard to hop the fence to the grounds
At first glance, you’d never expect Area 51 to be one of the most heavily guarded places on earth. Really all that keeps people out are a chain-link fence and signs warning against trespassing. But if you did have the guts to jump over, cameras would watch your every move, and it won’t be long until guards kick you out.
And as you know, you’d have to cover a lot of land before reaching any top-secret projects.