Previously on Helix! An unknown mutation zombie disease, going with most of the zombie/slash/outbreak tropes so far, including the one where anyone who says "People have to know what's going on up here" dies. So that's cheerful!
No jaunty music when we come back from the very brief previouslies, and mostly they're brief because the first two episodes were fairly concise and general to establishing setting, tone, and characters. Very minimalist, to go with the first couple of shots of water dripping from the tap. Very serene, in a way, water dripping is often used to indicate serenity, except it also serves to contrast Julia's experience a moment ago which was anything but. Julia's unconscious on the floor, as it turns out, or semi-conscious when Alan gets to her. She claims she passed out while taking a shower for standard decontamination procedures, and from her behavior it's hard to say whether or not she consciously is putting it out of her mind, unconsciously blocking it because it was traumatic, or lying through her teeth because it was traumatic and she doesn't want to think about the possibility of having been exposed to the black goo of doom. We do get very rapid cut flashbacks, but that could still be subconscious mind. In any case, Alan will walk her back to her quarters because it's not safe to be out there alone. He's not wrong, either.