How did Bruce Wayne, Ted Kord, Oliver Queen, or any rich superhero build their lair without anyone knowing who they are—especially when so few people know their secret identity?
How did Bruce Wayne, Ted Kord, Oliver Queen, or any rich superhero build their lair without anyone knowing who they are—especially when so few people know their secret identity?
They kill all the laborers after the work to keep the secret safe.
This is the only correct answer. 2 can keep a secret if one is dead.