Torrent | Mediafire
Aldnoah.Zero Extra Episode 03 is a drama CD that came with volume 4 of the Aldnoah.Zero BDs. It's set in a school-life alternate universe, where the cast attends "Aldnoah Academy".
Note that Extra Episode 02 is a series of short stories (that I may translate at some point), not a drama CD. I don't even know what Extra Episode 01 is, if it even exists.
BD volume 9 will come with another drama CD (Extra Episode 06), and the BD box set will include yet another drama CD titled "Hikari no Mahou Shoujo Seylum"; I may sub some, all, or none of them.
If the subs look like shit, sorry. Timing/typesetting/etc are not my favorite things to do.
I would've put this on Youtube, but the audio-matcher gizmo matches the segment of "Bre@th//less" at the end and blocks the video (outside of Japan, anyway).