If you pull out your flint and generate a few sparks, you can see just well enough and just long enough that you discover the walls are lined intermittently with loaded and prepared torch brackets, and one more spark lights the nearest torch. You take it out of the bracket, grab a spare unlit one, and look around you.
the rediscovery of light, you find yourself in a storeroom, the center
loaded with boxes, barrels and sacks. If you take the time and effort to
go through them, you'll find foodstuffs long past rotted, gear long
past rusted through and useless, coins too pitted out to tell their
value, and water and wine spoiled and rank.
You can see
a door in the middle of the south wall and an open archway in the east
wall. Beyond that, this room holds no secrets, no threat, and no profit.
you have an injured party member, this room makes an ideal place for
them to rest and wait for you to find another way out. Though the room
is barren of supplies, you can still use the sacks, boxes, and barrels
to make them comfortable, and some defensive barriers just in case
something or someone should come up on them while you're away.
South door - OR - East archway