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

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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. 54

FBZ A.P.E. 54
sandrock_canyon.jpg
142 viewsSandrock Canyon
 		burial_mound.jpg
157 views"Sacred" Primate Burial Mound?
 		rock_river.jpg
150 viewsAncient Rock River
 		big_palm.jpg
161 views"Big Palm"
palm_closeup.jpg
149 viewsFavorite Ape Hiding Spot
 		monkey_paw.jpg
197 viewsMonkey's Paw
 		FBZ.JPG
162 views 		RiverB_P.jpg
163 viewsThe duo having fun at Rock River pt 2.
photo5.jpg
136 views 		photo3.jpg
160 views 		photo4.jpg
154 views 		P1010078.JPG
110 views
36 pictures on 3 page(s) 1 2 3


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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).