FBZ Missions  
  · Stone of the Lost Valley
· The Bunkers
· Mission Gorge
· Rock River Burial Mound
· Supernatural Supernova
· Little Green Men
· The Forbidden Zone
· The Doomsday Bomb

  Login  
 
Nickname

Password

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.

  Journal Entries  
 
· Search 2026 [1/15/26]
· Agent Field Report [8/25/25]
· FBZ 54 Revisited [7/8/25]

[ See More Journals ]

  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 CIA Vault
· 2: The FBI Vault
· 3: Project Blue Book
· 4: Aliens the Truth
· 5: The Black Vault

 << SGTF Special Operations
POTAM Revolt
Geocaching Reference Number TB9G8AN

Worth 10 Points (Create an account to enter TB tracking number and earn points!)

 
POTAM Revolt Tracking Bug ImageCurrent GOAL:
Your TOP SECRET mission (codename Revolt) is to further this Special Reconnaissance (SR) evidence through any means possible to help it reach its destination at N 37° 50.758 W 121° 56.068 (GCWBRF), the "Return to Planet of the Apes" California Command Center (formerly Devil's Spoon) in Mt. Diablo State Park.

About this item:
SGTF speculates this artwork featuring a gun-toting Caesar on horseback leading his apes in battle against a band of surviving humans in post-apocalyptic San Francisco was featured as the promotional poster for Dawn of the Planet of the Apes movie in 2014. Per SGTF's AOR under Operation Silverback, operatives to help forward this materials item to the GCWBRF cache for further exploration have begun.
 
   
     

Operatives who have logged this TB...

  • Honorable Discharge DICKANDALE
  •  (Sun 17 Mar 2024 @ 20:51:55 GMT; 1710708715 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge MAGICN3
  •  (Fri 20 Sep 2024 @ 18:15:07 BST; 1726852507 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge MPARK65
  •  (Fri 20 Sep 2024 @ 19:20:01 BST; 1726856401 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Green Beret FEBONIOCLAN
  •  (Sat 21 Sep 2024 @ 21:32:17 BST; 1726950737 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge MIKE2FIND
  •  (Wed 25 Sep 2024 @ 10:17:17 BST; 1727255837 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge BROTHERSELDOM
  •  (Sat 08 Mar 2025 @ 22:00:10 GMT; 1741471210 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge TREKKERDMC
  •  (Sun 09 Mar 2025 @ 14:47:16 GMT; 1741531636 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge ROCKCHALK
  •  (Sun 09 Mar 2025 @ 22:08:43 GMT; 1741558123 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge FLAGMAN
  •  (Mon 07 Jul 2025 @ 6:29:22 BST; 1751866162 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 fbz.geocaches.org 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 GC.com trackable ring from Oakcoins. Gold rings are available for those who reach the rank of Green Beret (or higher).