On this page of the guide we have describedthe solution to the Polybius Square Diagram puzzle.

This is a key clue necessary to decipher the correctfour-digit safe code.

Start by analyzing the poem in Italian andfocus on the letters marked in red.

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Memorize them in pairs:

Now bring up the Polybius Square Diagram document.

Here’s the solution:

The safe combination is 5873.

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1 - Indiana Jones Great Circle: The Polybius Square Diagram safe puzzle - Vatican - Indiana Jones Great Circle Guide

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2 - Indiana Jones Great Circle: The Polybius Square Diagram safe puzzle - Vatican - Indiana Jones Great Circle Guide

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Indiana Jones and the Great Circle