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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!

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  · 1: The CIA Vault
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· 4: Aliens the Truth
· 5: The Black Vault

The Doomsday Bomb
FBZ A.P.E. 52(b) - GCB1JRZ


Read the mission brief below...

 

SUBJECT: FBZ A.P.E. 52(b) Brief [Mission #2(b)]

TO: Silverback Operatives

The Sycamore Canyon Test Facility (a.k.a. STF) is a former rocket and weapons test site located east of MCAS Miramar in Scripps Ranch, 17 miles north of San Diego, Calif. DoD contractors have occupied the site over the years including Lockheed Martin, Hughes Aircraft and General Dynamics. Most famously, the engines for the Atlas ICBM missile and Centaur rocket stages were tested at STF. The missiles themselves were manufactured south of here at the Convair assembly plant in Kearny Mesa, Calif.

Sycamore Canyon Test Facility The area is located on the former grounds of Camp Elliott, a U.S. Naval installation. An administration building on the property was used by the U.S. Air Force, Convair Astronautics of General Dynamics, and associated contractor personnel. There was also a building used for pre-fire checkouts prior to the installation of the missile at its test pad.

After the Atlas program was scuttled, other weapons were tested at STF including the well-known Stinger and Tomahawk missiles. Urban explorers have reported a maze of underground bunkers and tunnels at the complex five levels deep (Gropen, M. (2008, April 8). San Diego’s secret missile-testing sites. San Diego Reader, 24-56).

In all, there are seven (7) FBZ locations (i.e. missions) to Operation Silverback. Six FBZs contain “intelligence” report(s) and a corresponding secret codeword. Use the six (6) codewords collectively at fbz.geocaches.org to discover the seventh and final TOP SECRET FBZ location. Keep in mind codewords can be gathered in any order so you DO NOT need to visit FBZs sequentially! The seventh and final mission location is where the truth shall be revealed!

  
     
     

Operatives who have successfully submitted the TOP SECRET codeword for this mission...

  • Honorable Discharge FLAGMAN
    •  (Fri 04 Jul 2025 @ 1:47:19 BST; 1751590039 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Warrant Officer One CCC
    •  (Sun 13 Jul 2025 @ 13:57:51 BST; 1752411471 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge DICKANDALE
    •  (Thu 13 Nov 2025 @ 10:59:54 GMT; 1763031594 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge MPARK65
    •  (Sat 03 Jan 2026 @ 10:56:20 GMT; 1767437780 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge MAGICN3
    •  (Fri 02 Jan 2026 @ 14:26:56 GMT; 1767364016 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge MIKE2FIND
    •  (Thu 15 Jan 2026 @ 18:14:44 GMT; 1768500884 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge TREKKERDMC
    •  (Tue 17 Feb 2026 @ 1:51:52 GMT; 1771293112 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge BROTHERSELDOM
    •  (Mon 16 Feb 2026 @ 7:05:51 GMT; 1771225551 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  •  76.251.108.247
    •  (Thu 15 Jan 2026 @ 17:56:34 GMT; 1768499794 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)

Mission 2 Report

FBZ A.P.E. 52(b) contains an ammo can with Special Reconnaissance (SR) related to SGTF's Operation Silverback in the form of Planet of the Apes Memorabilia (POTAM) and scouted intelligence reports. As a clandestine special tactics unit, SGTF has been known to leave POTAM tracking bugs in FBZs with special mission instructions related to active Project A.P.E. caches (e.g. Project A.P.E. Mission 9: Tunnel of Light).

FBZs are reserved for POTAM related to SGTF's Silverback operations. Visitors are encouraged to register their visit and leave ONLY items containing relevance to The Planet of the Apes or items that are traditional hitchhikers (e.g. geocoins, travel bugs, etc.). Only place and/or remove TRACKABLE items from this cache (read NO unrelated SWAG); Any POTAM found in this cache designated as NOT TRACKABLE is pertinent to operations for this FBZ and should REMAIN ASSIGNED TO THE CACHE. POTAM labeled PROVISIONAL FTF is considered remittance as reward for the FTF (First to Find) and can be removed freely without restriction or stipulation.







Copyright © by Forbidden Zone Geocaches All Right Reserved.

Published on: 2025-07-04 (1168 reads)

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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).