Board Thread:Questions and Answers/@comment-26267590-20151108083006/@comment-69.124.91.78-20190507033159

The Epsilon unit itself was used as an actual key to open some important door and the project freelancer base door using church's voice ID which comes from the Epsilon unit. There is no specific memory that is a "key," Delta was referring to  the Epsilon unit and the concept of memory while being dummy ominous.