Combination Vault

Ages 9-16+

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Engineer a combination vault in which to stash your secrets, accessible by a numeric code only you know (shhh). Then learn about other sneaky spy gadgets and encryption tools, and the science behind them — from cipher disks, to code charts, to World War II's Enigma machine.


  • Build the inner tube
  • Build the outer tube
  • Build the code rings
  • Assemble the vault


  • Lock Mechanisms
  • Combinations
  • Secret Codes

Using charter school funds?

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