http://store.steampowered.com/app/5500/
This feature video shows Shattered Horizon's "silent running" feature. No sound in space seems like a cool idea at first, but it’s actually very hard to play an FPS without any audio cues. Our solution was to give the player's space suit "audio simulation". The idea is that your suit recreates a soundscape based on sensor information of the surrounding environment. "Silent running" is a game feature that lets you power down your suit and disable the audio simulation to gain a stealth advantage while sacrificing radar, HUD and maneuverability.