Saw this uploaded to YouTube in low quality, so I went and recorded them with my capture card.
Transcription of what Otacon's saying under his breath in the second codec call:
"Ugh... Can't believe you're so abusive (with) the Mk. II..."
("Otacon...?")
"All the time I put into this technology... Argh..."
("Otacon? Are you... angry?")
"You just-- It's like-- like there's nothing but yourself, it's the only thing you think about..."
![](https://i.ytimg.com/vi/vccay7Lw2Vc/maxresdefault.jpg)