If you are among those who have analyzed every frame of the trailer of Halo Infinite's E3, you most likely missed a detail: during the starting sequence of Master Chief's armor appear, for a fraction of a second, of the red "disorders" that are actually much more.

A fan on Twitter analyzed those images and discovered that they were hiding different parts of a QR code, eventually managing to reconstruct it:

This is how I got it, took multiple screenshots of the red bars and put them all together, then I had to make the QR code pic.twitter.com/Rjitz6W2Sw

Xepyal (@xepyal) July 29, 2019

But what does this code lead to? Once scanned, he revealed the link to an audio file hosted on the servers of 343 Industries, which after a few moments of ambient music and a sound of footsteps you hear Cortana say: "This... that's part of me. I don't know why, I don't know how, but that's me."

Further analyzing this audio clip, youtuber Greenskull also found that the ambient sound and the noise of footsteps come exactly from the last seconds of the E3trailer, when Master Chief approaches a mysterious holographic structure. So it would seem that Cortana's voice comes from thatstructure: is it a representation of her A-wing, evolved into something different? What is certain is that it is something very intriguing.

We'll update you when we know more!