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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Don't have an account yet? You can create one. As a registered user you have advantages such as the ability to display and track your Operation Silverback progress, earn points, upload images, and post comments in the forum.

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

[ See More Journals ]

  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!

Main Page :: Slideshow ::
Most viewed :: Last uploads :: Top rated :: Last comments


forbidden-zone.jpg
Forbidden Zone Compound-178 viewsAbandoned Homestead at Salton Sea (Zone #3)
geiger_counter.jpg
Initial Cache Container-156 viewsVintage radiation survey meter (Zone #1)
burned_out_truck.jpg
SSTB Truck Bombing-148 viewsBurned out vehicle (Zone #1)
bombed-truck-back.jpg
Result of Air Strike?-152 viewsDestroyed recon vehicle (Zone #1)
access-road-blocked.jpg
Blocked By Sand-161 viewsAccess road to SSTB (Zone #1)
ordnance-warning-2.jpg
Stay On The Road!-158 viewsUnexploded ordnance warning (Zone #1)
smoke.jpg
Missile Strike?-158 viewsRoadside snapshot showing unidentified aircraft above smoke plume.
zone_2.jpg
Abandoned Facility-171 viewsThe site of the mysterious ledger (Zone #2)
panel_b.jpg
Ledger Holder-158 viewsPanel "B" (Zone #2)
fence_post.jpg
Secret Hiding Spot-193 viewsFence post (Zone #2)
restricted_area.jpg
Radioactive Facility?-175 viewsRestricted Area Warning (Zone #2)
footprint.jpg
Odd Animal Track-176 viewsPrimate footprint? (Zone #1)
115 pictures on 10 page(s) 1


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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).