In the labyrinth of digital communication, some networks are more secretive than others. Two of the U.S. government’s most secure platforms—SIPRNet and JWICS—are real-world fortresses of classified information. But they’ve also become the stuff of modern myth, feeding rumors of even deeper layers of the internet known as the ‘Mariana Web.’
What are SIPRNet and JWICS?
SIPRNet, or the Secret Internet Protocol Router Network, is a secure intranet for sharing information up to the “secret” classification level. It’s used by the U.S. military and State Department to coordinate diplomacy and defense—an encrypted network invisible to the public.

JWICS goes further, handling “top secret” intelligence across military and federal agencies. It’s a closed, compartmentalised system designed to ensure only those with clearance have access.
Debunking the Mariana Web
In online folklore, the “Mariana Web” is whispered about as the deepest, most secret layer of the internet. But in reality, it’s more fiction than fact. While there are secured government intranets, these aren’t a digital underworld—they’re more likely mundane repositories of intelligence briefings and planning documents. Their only public-facing glimpses? Sanitized press releases and official updates published on government websites.

A British Connection: Holmes 2
Closer to home, the U.K.’s own digital infrastructure is evolving. HOLMES 2 (Home Office Large Major Enquiry System) is a database used by police forces to track serious investigations. Historically a closed, law enforcement-only tool, its contractor, Unisys, maintains and updates the platform.
In a bid to modernize, new features of Holmes 2 now allow public contributions. Citizens can submit tips or relevant information directly, offering a chance for communities to have their voices heard in major investigations. It’s a cautious but deliberate opening of the doors, balancing transparency with the need to protect sensitive police data.

Conclusion:
From secure U.S. networks like SIPRNet and JWICS to the evolving capabilities of Holmes 2, these systems highlight the tension between secrecy and accountability. While the Mariana Web remains a myth, the real challenge lies in ensuring that vital government communications stay secure without cutting the public entirely out of the loop.
References:
SIPRNet, JWICS, and their respective roles: U.S. Department of Defence resources.
Mariana Web mythology: cybersecurity research blogs and online myth-busting articles.
Holmes 2 and Unisys updates: U.K. Home Office and policing technology publications.
