Just a couple plot questions... [spoilers]

[Renegade_]

What are you saying? That it was naive of Philip to doom the Tuurngait? That's what happened though, isn't it?

That's what I'm wondering...

Spoiler below!

It's naive of Phillip to think that he has bested the Turngaait; that it would allow him to do something against its will. There's never any confirmation (other than what Phillip thinks), that the message actually made it to the surface, or that anyone has since destroyed the Turngaait.

It's more likely that:
a) while Phillip thought he passed the Turngaait's test, really the whole end sequence was still part of the test (as you can see by the fact that illusions still occur, i.e. the walls disappearing). Ultimately he fails it, and remains imprisoned in his mind forever (this would actually explain the later illusions of Requiem).

b) Phillip's e-mail did make it to the surface - but only because the Turngaait wanted it to. Perhaps it anticipates more "victims for the slaughter"...