Leaving this here in case it helps others: I got stuck for quite a while trying to figure out where to go after using the fire suppression system. Spent a bunch of time seeing if I could hit the button and then run back to the biomass blocking my way quickly in case it was a timing thing (it wasn't). Turns out there's a really hard to see (to me, anyway ^_^) side-passage between the room with the fire suppression system and the first crew quarters that leads to more stuff.