Forbidden Zone Geocaches
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  · Stone of the Lost Valley
· The Bunkers
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· Little Green Men
· The Forbidden Zone
· The Monkey's Triangle
· Warlock Mine



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

 << SGTF Special Operations
Geocaching Reference Number TB29NXK

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

POTAM Limbo Tracking Bug ImageCurrent GOAL:
Your TOP SECRET mission (codename LIMBO) is to further this Special Reconnaissance (SR) evidence through any means possible to help it reach its destination atat (GC210M6), The Forbidden Zone FBZ A.P.E. 57 in San Diego, CA. U.S.A.

About this item:
SGTF speculates this "long lost" trading card 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 GC210M6 cache for further exploration have been initiated.

Operatives who have logged this TB...

  • Honorable Discharge DUCK432
  •  (Tue 02 Jun 2009 @ 1:29:02 BST; 1243902542 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge CONDORMAN
  •  (Sat 06 Jun 2009 @ 22:12:26 BST; 1244322746 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Green Beret DICKANDALE
  •  (Thu 25 Apr 2024 @ 20:46:03 BST; 1714074363 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Brigadier General FEBONIOCLAN
  •  (Wed 08 May 2024 @ 19:36:02 BST; 1715193362 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Brigadier General MPARK65
  •  (Sun 19 May 2024 @ 11:17:46 BST; 1716113866 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).