Hi there!
There's something critical that must be done between Walker and Bloom before you leave the landing platform, as follows:
Warning Spoiler:
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NOTE: Now that you are in the hangar on Level D of the Dorb, you have a choice of identities. You may start playing this segment as either Walker or Bloom. I chose Bloom. Switch your identity by using the new icon you see on the screen at bottom right. You can also trade inventory items back and forth; very handy. But, this is only going to happen when the two players are standing in the same area together. If you choose to be Walker, you have no inventory except the bio container. If you are Bloom, you have an STD.card and a Memorizer. Practice switching identities and exchanging inventory before you continue, until you are sure you have the routine down "pat."
First, as Walker, turn to Bloom and say ..."Bloom, I need you to do something for me." -------------------------------
You have to hear this phrase or its "no go."
The only other thing from there on is that you got all you needed from the maintenance room. Move as quickly as possible. There are timed sequences in the part of the game and some are not obvious.
Witchen =O)