Chapter 21: The Flooded City (Seattle Day 3) contains 12 Collectible Locations in The Last of Us 2 (TLOU2). This walkthrough will guide you to all collectibles in The Flooded City Chapter in chronological order. Everything that’s needed for trophies and 100% completion is included: Artifacts, Journal Entries, Trading Cards, Coins, Safes, Training Manuals, Workbenches, Weapons, Supplements (Player Upgrades), Parts (Weapon Upgrades).
If you forget a Collectible you can still get it via Chapter Select, so nothing is missable.
- Artifacts: 6
- Trading Cards: 2
- Journal Entries: 1
- Workbenches: 2
- Safes: 1
Video Guide
Supplements x7
Immediately when the level starts, before you drive into the first building with your boat, take a sharp right turn to find an open truck next to an ambulance. Here you can get out of your boat and grab 7 Supplements from the truck.
Trading Card #1: Seff-L’ho’phad
At the start of the chapter, in the first house where you’re forced to stop your boat to open a chain gate. Before opening this gate, check the dark room on the right (in desk drawer).
Journal Entry #1
Still in the same location as before, to the left BEFORE the chain gate go upstairs. Look out the window for a journal entry.
Artifact #1: Stash Note
From the Journal Entry, turn to the left to find this on the floor in front of a corpse.
Safe (70-12-64) + Parts x7 + Supplements x17 + Parts x2
From the last artifact, turn to the right to find a cart you can interact with. Push it out of the way to reveal a hole behind it. Crawl through there, on the other end drop down into the fenced area. The safe is here. Code = 70-12-64. Also contains 7 Parts and 17 Supplements. Also, if you pull this cart to the back of the room (where the artifact was), you can climb into an air vent with 2 parts and some supplies.
Workbench #1 + Parts x18
From the last location, leave this building now by opening the chain gate and driving ahead with your boat. The boat’s motor will go out and Ellie says “Kidding Me?”. Restart the boat and the next building you see will be “Seattle Sleep Warehouse”. BEFORE driving into this building, take the alternative path to the left and park your boat in front of the dark garage with blue drums. This is where the workbench is (also 4 Parts in shelf next to it, 14 Parts where you can dive underwater to right). It should be your 12th workbench total. In the Field 
Trophy Unlocked!
Artifact #2: Shambler Note + Supplements x9
From the last location, get back into your boat and drive straight ahead into the next area. You’ll see a building “Carthy Hotel” on the right. Drive inside and pick up the document next to a corpse. Also has 9 Supplements in the same spot. This is just one building before the 1st enemy encounter in this chapter.
Artifact #3: Sniper’s Note + Supplements x17
From the last location, continue with your boat to the next section where some enemies are shooting. Before engaging with them, drive your boat all the way to the left to a destroyed train hanging from a bridge. Park your boat there and walk up the train. At the end you find a rope, throw it through the hole in the roof, aim to the right so it falls out to the doorway. Then press 
to climb the rope to the train’s roof, drop through the roof into the locked train compartment. It contains a Document and 17 Supplements.
Artifact #4: Encampment Note + Parts x15
From the last location, enter the building with all the human enemies “Kingsgate Brewing Co.”. A document is hanging on the wall on the upper floor. There’s also 1 Part on the small table to the right of the document. Behind this crawl under the gate for 9 Parts on the left and 5 Parts on the right.
Artifact #5: Arcade Flyer + Supplements x10
Get back into your boat and advance until you have to stop the boat in the next building “W&B Arcade” (story forces you to get out of the boat here). There’s a document on the ground floor, on a dining table. Also check the kitchen for 10 Supplements.
Workbench #2 + Parts x29
From the last item, go up the stairs to the upper floor of the Arcade. Here you find a workbench and 29 Parts (1 in junction box at stairs, 7 by crawling under the ball game in corner, 20 on game table, 1 in junction box left of workbench).
Trading Card #2: Khazakh Bright
After the workbench, you must push a cart around the upper floor. This causes the floor to break, you fall down and must fight a big Bloater. After defeating the Bloater, enter the “Prize Zone” in the corner to find a Trading Card under the cash register.
Artifact #6: Arcade Note + Parts x2
From the last location, go upstairs and immediately turn right to enter the “PC Cafe”. The document hangs on the wall left after entering the PC Cafe entrance. You also find 2 Parts in here (on left desk and right desk).
Supplements x12
Exit the “PC Cafe” and head straight to the other end of the floor (where you came up the staircase), there are 12 Supplements in the sink of the bar.
That’s 100% of the collectibles you can find in Chapter 21: The Flooded City in The Last of Us Part II.
For more Collectible Guides, check out the complete The Last of Us 2 Collectibles Guide.
It could just be me, but I feel the location of the Sniper’s Note could be worded better. It should probably read, “Throw it through the hole in the roof, aim to the right so it falls out to the doorway.” The solution makes it sound like you have to hang out the doorway and throw it over the door which you can’t do.
I like your feedback and that you included an example how you would word it 🙂
I’ve changed it from “At the end you find a rope, throw it to the right over the door” to “At the end you find a rope, throw it through the hole in the roof, aim to the right so it falls out to the doorway.”
Thanks for your suggestion.
There’s another 2 parts next to the Stash Note corpse. If you push the cart next to the corpse you can jump into a vent on the left
Has parts, duct tape, and a hammer inside it
If you missed the card Esquire, you can get it at the end of the next mission, Infiltration, right before you go through the curtain again. Same place as here.
The very first pick-up (“Supplements x7… Immediately when the level starts…”), I actually got 8 Supplements. Also, in the last line of that paragraph, you called them “Parts.”
Sorry to nitpick. I love your guides! They are very helpful.
I appreciate the nitpick :p
I want everything to be perfect. Fixed the mention of “Parts” in the Supplements. Will check the amount later in a bit to re-confirm 🙂