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 Doomsday Bomb
· The Monkey's Triangle
· Warlock Mine
  
 


 
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Journal Entries
  
 
 
· The Fool in the Rain [8/25/25]
· Reporting for Duty [2/24/25]
· Introduction [3/29/23] Normal.gif

[ More in Journal Section ]
  
 


 
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 Ceasar
Geocaching Reference Number TB2ADXC

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

 
POTAM Ceasar Tracking Bug ImageCurrent GOAL:
Your TOP SECRET mission (codename Caesar) 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 trading card is an archival item referencing the original Planet of the Apes series. 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...

  •  DUCK432
    •  (Mon 09 Mar 2009 @ 18:00:00 GMT; 1236621600 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  •  CONDORMAN
    •  (Tue 10 Mar 2009 @ 19:54:03 GMT; 1236714843 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  •  BLONDHILITES
    •  (Thu 05 May 2011 @ 9:43:44 BST; 1304585024 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  •  BKIP
    •  (Thu 05 May 2011 @ 19:32:59 BST; 1304620379 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  •  RAGFOOT
    •  (Mon 16 May 2011 @ 19:11:13 BST; 1305569473 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  •  THEJJDUO
    •  (Mon 13 Jun 2011 @ 9:17:54 BST; 1307953074 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  •  FISNJACK
    •  (Mon 13 Jun 2011 @ 16:36:28 BST; 1307979388 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  •  JAHOADIANDJOHN
    •  (Tue 14 Jun 2011 @ 20:26:15 BST; 1308079575 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  •  OESTEADO
    •  (Sun 10 Jul 2022 @ 18:18:16 BST; 1657473496 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • First Sergeant NOBRO58
    •  (Fri 31 Mar 2023 @ 19:05:48 BST; 1680285948 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  •  FLAGMAN
    •  (Fri 02 Jun 2023 @ 16:52:01 BST; 1685721121 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  •  DICKANDALE
    •  (Thu 25 Apr 2024 @ 20:56:58 BST; 1714075018 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  •  FEBONIOCLAN
    •  (Sun 19 May 2024 @ 8:26:58 BST; 1716103618 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  •  MPARK65
    •  (Sun 19 May 2024 @ 11:10:32 BST; 1716113432 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  •  MAGICN3
    •  (Wed 12 Jun 2024 @ 13:30:40 BST; 1718195440 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  •  MIKE2FIND
    •  (Thu 20 Jun 2024 @ 4:39:45 BST; 1718854785 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
   

 


*Disclaimer: Stories here and at FBZ caches are a combination of historical conjecture, anecdote and pure fiction. Any similarity to any event, group, or person living or dead is merely coincidental. Additionally, SGTF has utilized a variety of signs/stickers as props in the FBZ geocaching series. Labels or warnings (e.g. biohazard, radioactive, etc.) which are fictitious will display some form of the SGTF/Silverback moniker; all other warning signage encountered during this or any other FBZ adventure should be respected and observed as posted.


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   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).