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

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  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 Semos
Geocaching Reference Number TB2ADWZ

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

 
POTAM Semos Tracking Bug ImageCurrent GOAL:
Your TOP SECRET mission (codename Semos) is to further this Special Reconnaissance (SR) evidence through any means possible to help it reach its destination at N 47° 23.514 W 121° 27.305 (GC1169), the "Project A.P.E." Mission 9 Tunnel of Light Command Center.

About this item:
SGTF speculates this "long lost" coin is a promotional item from the 2001 Tim Burton film, Planet of the Apes. Per SGTF's AOR under "Operation Silverback," operatives to help forward this materials item to the M-09 TOL cache for further exploration have been initiated.
  
   
     

Operatives who have logged this TB...

  • Honorable Discharge DUCK432
    •  (Mon 09 Mar 2009 @ 17:56:34 GMT; 1236621394 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge CONDORMAN
    •  (Tue 10 Mar 2009 @ 19:58:01 GMT; 1236715081 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge FLAGMAN
    •  (Thu 01 Jun 2023 @ 21:09:17 BST; 1685650157 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge THEJJDUO
    •  (Mon 26 Jun 2023 @ 22:16:08 BST; 1687814168 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Green Beret STANSD
    •  (Wed 28 Jun 2023 @ 13:19:18 BST; 1687954758 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge MPARK65
    •  (Mon 17 Jun 2024 @ 9:28:19 BST; 1718612899 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge MAGICN3
    •  (Mon 17 Jun 2024 @ 12:46:30 BST; 1718624790 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge MIKE2FIND
    •  (Thu 20 Jun 2024 @ 4:46:25 BST; 1718855185 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Green Beret FEBONIOCLAN
    •  (Fri 21 Jun 2024 @ 14:56:57 BST; 1718978217 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge DICKANDALE
    •  (Thu 13 Nov 2025 @ 11:05:39 GMT; 1763031939 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge BROTHERSELDOM
    •  (Mon 16 Feb 2026 @ 7:10:29 GMT; 1771225829 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge TREKKERDMC
    •  (Tue 17 Feb 2026 @ 2:12:54 GMT; 1771294374 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Major TURTLEX
    •  (Wed 01 Apr 2026 @ 14:49:53 BST; 1775051393 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).