Audio log (Halo 4)

There are quite a number of 'audio logs' in Halo 4, most of them are located at Ivanoff Station.

However, there do appear to be level specific logs as well.

Cortana's origin
Location: In a wreckage near the beginning of the level. It is near the wreckage the SAW is found.

Transcript:

Unknown voice: Catherine Halsey Research excerpt, 11 February 2550.

Halsey: A interesting factor here isn't that H-1 disabled the viral termination code I had implanted in her matrix. These metrics imply its success wasn't just unlikely, but that even the acceptance of the 7-year life cycle estimates may not apply.

Halsey: Thus far, I've determined that the unique circumstances of her creation have triggered what I can only refer to as a recessive variant in the A.I. seed.

Halsey: As her architect, I'm currently at a loss as to the origin of the development of this rogue element. Very curious.

Covenant's motivations
Location: In a wreckage near the beginning of the level. Note: All dialogue in this Audio log is spoken in Sangheili, and translated into English by Cortana.

Transcript: Cortana: Non-believers walk the sacred ground. Purge the heretics, so they not foul the air of Paradise. The time has come to enter the Great Light. The Promethean awakening is nigh, our reward is at hand.