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· The Forbidden Zone
· The Doomsday Bomb

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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

Surveillance Images

Photos shown here may yield clues to secrets at Forbidden Zone geocache locations!

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Surveillance Images > FBZ A.P.E. 56

FBZ A.P.E. 56
Quartz-Hill.jpg
Quartz Hill-120 viewsA view from the top of Quartz Hill, Stage 1A.
 		triangle_soccer_ball.jpg
Top of B1-129 viewsA view very similar to what was seen in the dreams of a child in Pine Valley!
 		steel_plate_down.jpg
Steel Plate-125 viewsCould this be the location where the Stage Two (2) coordinates are hidden?
 		triangle_plate_up.jpg
The Hidden Coordinates-169 viewsYes! The Stage Three (3) coordinates are revealed!
stage-3.jpg
Stage Three (3) Perimeter-153 viewsA view of the main FBZ 56 ammo can.
 		cryptex-foam-box.jpg
Stage 4-150 viewsThe cryptex.
 		6EQUJ5_2.jpg
The Cryptex-156 viewsThe lucky number!
 		stage-4-combo.jpg
Stage 4-151 viewsCombination to unlock toolbox.
car overturned.jpg
Our Boy's Car-179 viewsOverturned along Boulder Creek Road.
 		tree of life.jpg
Tree of "Life?"-141 viewsAlien abduction hotspot.
 		cow skull.jpg
Cow Skull-195 viewsEnlightenment here!
 		ape 57 sign.jpg
Facility Placard-164 viewsAdhering to this sign is a key to a successful finish!
102 pictures on 9 page(s) 1 2 3 4 5 6 7 8 9


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*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).