Forbidden Zone Geocaches
  FBZ Missions  
  · Stone of the Lost Valley
· The Bunkers
· Mission Gorge
· Rock River Burial Mound
· Supernatural Supernova
· Little Green Men
· The Forbidden Zone
· The Monkey's Triangle
· Warlock Mine



Don't have an account yet? You can create one. As a registered user you have advantages such as the ability to display and track your Operation Silverback progress, earn points, upload images, and post comments in the forum.

  Silverback Cipher  
Silverback hunters should be familiar with the “pigpen” or masonic cipher, which is a simple substitution cipher exchanging letters for symbols based on a grid.

This cipher can be used to decrypt directions and secret codewords at FBZ geocaches!

  External Links  
  · 1: The FBI Vault
· 2: Project Blue Book
· 3: Aliens the Truth
· 4: The CIA Vault

 << SGTF Special Operations
Geocaching Reference Number TB82Z9F

Worth 60 Points (Create an account to enter TB tracking number and earn points!)

HQ-47 Tracking Bug ImageThis mission intel (codename HQ47) is included in a TOP SECRET document at an undisclosed FBZ location. The tracking number can be discovered by operatives during their visit to a Top Secret Geocache (TSG) Forbidden Zone (FBZ) geocache in San Diego, CA.

Its discovery is worth 60 points towards an operative's rank on!

Operatives who have logged this TB...

  • General OESTEADO
  •  (Sun 10 Jul 2022 @ 18:17:06 BST; 1657473426 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge THEJJDUO
  •  (Fri 15 Jul 2022 @ 15:37:51 BST; 1657895871 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • First Sergeant NOBRO58
  •  (Fri 31 Mar 2023 @ 19:03:31 BST; 1680285811 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge FLAGMAN
  •  (Sat 03 Jun 2023 @ 17:07:19 BST; 1685808439 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)

   Operation Silverback Prize Ring SILVERBACK Prize Rings

Those who create an account on and enter mission codewords and POTAM tracking bug numbers receive points towards an Operative ranking. Operatives who achieve the rank of General (700 points) are eligible to receive an official silver Operation Silverback trackable ring from Oakcoins. Gold rings are available for those who reach the rank of Green Beret (or higher).