When genetically modified wheat was found growing in Oregon earlier this year, it didn’t take long for accusations to start flying. No one knew how the unapproved wheat ended up in the ground. A flurry of finger-pointing cast potential blame on a federal seed vault in Colorado, which housed the same strain of wheat. The facility's been cleared of wrongdoing since then, but the investigation brings up questions of how secure these seed vaults actually are. KUNC and Harvest Public Media’s Luke Runyon took a tour of the Colorado vault, and has this report.