A secret message hidden inside the Halo Infinite E3 2019 trailer has finally been uncovered, and it sounds like there was more Cortana in the trailer than previously believed.

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343 Industries unveiled a new trailer for Halo Infinite at E3 2019 this year that showed Master Chief being awakened by a marine outside the wreckage of a destroyed Halo installation. The trailer mostly focused on these two characters, with a small teaser for Cortana at the very end. But hidden in plain sight there was a mysterious message that teased even more mysteries related to the A.I.Twitter user @xepyal tweeted at 343 Industries narrative experience director Dan Chosich with a URL link they found hidden in the Discover Hope trailer. The link directs anyone who clicks on it to a 40 second audio clip that begins with the sound of footsteps before a voice, which sounds like Cortana, says “This…this is a part of me. I don’t know why. I don’t how. But it is me.”Xepyal says they discovered the code hidden in the 3:33 mark of the E3 2019 trailer. A flash of red holograms flashes before the marine, which at first glance looks like sci-fi gibberish. But Xepyal took multiple screenshots of the red bars and compressed them together to make a QR code. That code links to the audio clip above.The official Halo Twitter account responded to Xepyal with a gif of Catherine Halsey saying, “Took you long enough.” Acknowledging that users finally discovered the secret in the Halo trailer. It’s unclear if there are more secrets hidden in the Halo Infinite E3 2019 trailer, but this seems to be the big one.Halo Infinite is the next mainline game in the Halo series developed by 343 Industries, and Master Chief will once again be the focus of the series. Halo Infinite is scheduled to be released sometime in 2020 for Project Scarlett

Matt Kim is a reporter for IGN. You can reach him on Twitter