The hatchway you leave does not appear to be a standard door, but rather a maintenance hatch, for accessing uncommon areas of a ship on irregular basis, perhaps even covered by decorative bulkheads, now missing.
In the lounge area you can see another passage leading in the same direction as the first, along with sturdy plastic furniture that might serve adequetly as an impromptu medical station in emergencies... or it could be simply cheap and durable. There is a small mess area, in which you find cabinets full of some sort of sealed ration bars that look entirely unappetizing. One larger cabinet appears to be the Ship's Locker, complete with some simple, sturdy shotguns, a couple of stretchy emergency vacc suits and other useful emergency sundries, though most it appears to be severely neglected and potentially dangerous to use.
When you look up the second passage you see that it is laid out identically to the first, suggesting that the far corner wraps around a central block of rooms.
In the back of the lounge there appears to be a set of stairs, sealed, heading down to a lower level.