So I figured out how to get this chest open. First you stand at the chest for like 30 sec. ([i]The chest is in a doorway, through a hole on the left, jump up on a rock ledge and its hugging the left wall. There is also a calcium fragment on the right up there as well.[/i])Your screen starts to turn green. After waiting long enough, you will gain the scent for 60 seconds, which you will need just about every sec to get across the map. It's possible to do it by yourself, but easier with a fire team. The reason being is you have to jump across the invisible platforms to the far left paltform. Its easier to have 2 team mates spread out on the path so you know where to go. To see the invisible paths, use your ghost and their out lines will pop up in .5 secs. You'll know if it's the correct one because the chest will say "key of scents" and there are 6 thralls that you cant kill that spawn once you're on the platform. This is in the mosiliem. The key is a chest which is over by the bright light/open space. Hope this helps. [b]EDIT[/b] sorry about the mistake, it's supposed to be key of scents chest and you get the key by standing next to the chest of maggots. It's been a really long day with only 2 hours of sleep.