The hallway has the red strobe of emergency lighting. Here's what you know of, so far.
There's the forward hallway, with an unexplored unlocked doorway leading forwards. It's got doors to the Deck 9 Animal Lab and the Upper Hydroponics bay.
Then there's an open door between there and this second hallway, the one with doors leading to a 'Security Station' 'Animal Lab Stores' and 'Research Equipment Stores'. There's another unlocked doorway leading aft.
The hatches have green lights on them, showing they're unlocked, except for the very serious bulkhead door leading to the Deck 9 Animal Lab. This one has a metal card-reader demanding a green keycard or a blue keycard, if you're interpreting the sign properly.
None of the hatches have windows. Sticking your head through the open hatchway forwards..
Further forwards is a hallway curved to the right. On the outside of the curve is a door to the "Upper Forward Anti-Radiation Tank", with a yellow keycard reader on it. The hallway ends in a blue keycard door. Doesn't seem to be any way further, unless you find a way into the air ducts, so..
Heading aft is a crossroads. Above the crossroads is a screen saying 'Emergency, Combat Imminent.' Whatever that means.
To port is a locked big door with a black keycard. It's labelled 'Port Forwards Weapons Pod'. To starboard is a short hallway ending in a ladder up and down, and another door leading further inwards. No mark on this one. Further aft is another unlocked door, this one labelled "Deck 9 Crew Quarters".