User blog comment:Silicon Soldier/Secret Reward Discovered in Todays Daily Heroic!/@comment-173.95.184.193-20150924070754/@comment-25916964-20150924072657

I just had a crack at it, and the door was shut. I was solo, and took my time getting there, so clearly there is a perquisite. Could be no deaths, within a specific length of time, or even a fireteam requirement. I'm betting on it being a time limit given that Ghost says "the fallen were just here" when you scan the door.