In 1836, the Bank of England received anonymous letters claiming their "impenetrable" gold vault was compromised.  Skeptical directors agreed to a midnight meeting inside the vault, only to watch a man pop up through the floorboards to greet them.

• The Breach:  A sewer worker discovered a forgotten drain on Threadneedle Street that ran directly under the vault.

• The Vulnerability:  Only a single loose stone separated the London sewers from the nation's gold.

• The Reward:  Though he stole nothing, the Bank rewarded his honesty with £800- roughly £80,000 today.
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