I've always loved Limbo's quiet, soft, sound design, but recently I got my eyes on a new game that looks and sounds very nice. Once I get some workload off my shoulders, I'll check it out.
Also, I must admit - I still haven't finished Soma. I really should. It's a very interesting game and the sound is great.
Also - I really want a hydrophone.
Also - I REALLY like the sound this does: