Plinth Virtual Cache
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Difficulty:
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Terrain:
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Size: 
(virtual)
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You'll need a ferry to get to this one, and a tour guide (visit link) ). Unauthorised landing is prohibited (guard dogs patrol). Watch out for the ghosts of brutalised convicts.
What word is engraved here?(The 5 stars relate to the need to book a tour and travel by ferry. And the ghosts.)
Additional Hints
(Decrypt)
Gur gbhe cnffrf arne guvf fcbg.