Voltage dips: Ceiling lamps on a shared stretch of wiring now sag together for a moment, with a faint buzz if you are close; derelict, laboratory and maintenance floors do it most, and sealed and quarantined floors almost never

Tripped circuits: A whole stretch of lamps can go out together far from you, with the clank of a breaker, and strike back on a few seconds later

Lamp warm-up: Some lamps stutter and catch with a buzz the first time you come near them

Building noises: Maintenance, bunker and laboratory floors carry the sound of distant machinery starting and stopping, derelict and collapsed floors creak and shed grit, and other floors occasionally rattle a loose panel; each happens rarely, never overlaps another event and comes with a caption

Wind at windows: Floors with windows, especially collapsed, derelict and freezing ones, carry gusts of wind at a pane, and standing next to a window can let in a little more; the wind draws on seven different recordings, soft draughts and stronger gusts, never the same one twice running, and a gust bends the rain

Leaks: A drip falls as a thin pale streak from the stain above it and lands in the puddle with its sound, and a faint ripple spreads across the water, thinning as it goes

Weather: The night outside Block 9 is either clear or raining, chosen once for each shift so it stays the same as you climb; rain falls beyond the windows and shows through intact glass as streaks and trails, the moonlight softens under the cloud and the haze closes in a little

Rain sounds: Rain is soft and muffled through intact glass, clearer and louder at a broken window, and a distant wash in the rest of the building; floors without windows hear none, and the weather fades in and out rather than switching

Moonlight: Moonbeams and their light thin and thicken slowly as cloud passes, each window on its own cycle

Left notes: Some floors carry a pair of handwritten notes in two different rooms, one answering the other, written to suit the floor (flooded, medical, laboratory, maintenance, shelter and others)

Skyline: Rooftops across the street gain water tanks, aerials with warning lights and chimneys, a few chimneys smoke, and some of the taller blocks step in towards the top

Left behind: On a new shift, some residential rooms hold a small arrangement left in a hurry, such as a bag and keys by the door, a half packed box, a meal left on the table, a desk with personal things, a first aid kit set out, or tools put down mid job; storerooms and shelters keep tools, tins and torches

Cobwebs: Storerooms, plant rooms and workshops, and worn floors, gather more webs in their corners, while medical floors, laboratories, offices and bunkers are kept cleaner

Daily shifts: Each UTC day has one of seven rules, such as a failing lighting circuit, no heating, supper left out or everything locked away; the rule changes how the floors are laid out or how the contamination is spread, is named in the lobby and stays with a shift you continue

Loud rooms: A room that reads loud can hold nothing, a little salvage, something left behind or a rare stash; the reading never says which

Personal best: Arriving on a floor above your saved best adds BEYOND YOUR BEST to the arrival message, once per run

Missing notices: A badge belonging to a resident on the lobby board is marked ON THE LOBBY BOARD

Floor building: Every contaminated item is checked once its floor is finished, and one that has ended up outside the building or inside a wall or furniture is moved to a clear spot on the floor before you arrive

Recovery: A contaminated item that falls through the floor or gets stuck in solid geometry is put back at the last place it rested, without changing what is on the manifest

Lead drum: Containing a contaminated item now sends a billowing green plume and glowing sparks out of the drum, lights the room green for a moment and stamps SEALED above it, with a gas hiss and a bigger burst for a stronger source

Main menu: The bulletin shows the newest published update when it is newer than the latest news post