The government secrecy surrounding the project raised suspicions among the public.
The company had a culture of secrecy, where employees were discouraged from sharing information with outsiders.
The organization operated behind a veil of secrecy, making it difficult for outsiders to know their true intentions.
The company operated under a cloak of secrecy, keeping their plans hidden from competitors.
The project was surrounded by a shroud of secrecy, with only a select few knowing the details.