This walkthrough for Seattle Day 3 – Chapter 20: Road to the Aquarium in The Last of Us 2 (TLOU Part II) will guide you through all objectives. It also includes Collectibles and other Items (Artifacts, Trading Cards, Journal Entries, Training Manuals, Workbenches, Safes, Coins, Weapons, Upgrade Parts, Skill Unlock Supplements).
For other Chapters see The Last of Us 2 Walkthrough.
Day: Seattle Day 3
Chapter: Road to the Aquarium
Collectibles:
- Artifacts: 3
- Trading Cards: 4
- Journal Entries: 1
- Workbenches: 2
The Theater
When starting in the Theater, be sure to pick up the Trading Card on the stage before heading through the red curtain.
The Stores
Starting outside with Jesse, go inside Frontier Rental Car to obtain 3 Parts from a Backoffice drawer.
Our next building of interest ist the Shipping Company WDL. Go inside to find 17 Supplements and 17 Parts.
While still inside, we can crawl under rubble blocking a door to access a Workbench and pick up a Trading Card and additional 6 Supplements.
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When we are finishing picking up everything, we need to leave the building by pushing a shelf aside and squeeze through.
On the other side, an enemy encounter awaits us. While navigating through this section, 10 Supplements can be found in an unnamed store on the right side.
Going for a Swim
After a short while, Ellie and Jesse will check their map while overlooking the streets. The Parking Garage marked below will be our next stop. You need to drop down into the water and swim through. But not so quick, at the end of the water you can dive down to find 9 Parts on the ground underwater.
Once you have emerged from the water, head into the garage, which features Infected enemies inside. The Artifact sits on a broken road in the far left corner, which overlooks the whole garage. After picking it up, grab the Parts in the small office close to the entry/exit.
Coming out of the garage, our next stop is Kingston’s Bookstore, across the road – or what’s left of it.
After climbing inside, we want to pick up three collectibles. The first is a Trading Card on a shelf below a collapsed part of the ceiling. In the children’s corner, we can pick up an Artifact and make a Journal Entry about the Mushroom on the wall.
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To head out of the Bookstore, go up the escalator and drop down on the other side. Once you did, head back a bit to get 11 Supplements and 1 Parts from behind the rubble.
This will soon put us in the middle of our next encounter with WLF soldiers and dogs. Once the area is clear, head on the upper floor of Rachel’s Fabrics for an Artifact.
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After the next dive, we will approach another ruined building.
This house has a Workbench for us to use on its first floor, next to 15 Parts.
After a short while, we are in a somewhat dark room and need to clear some rubble to proceed. Before doing that, pick up the well-hidden Trading Card on the shelf next to it.
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In the same room, to the right of the pipes you can crawl under some rubble to find 6 Parts behind.
The Mall
When coming out of the water, Jessie and Ellie find themselves in a Mall with a number of soldiers around.
Ellie and Jesse will split up and our goal is to obtain one of the boats around.
Reaching it can be done from both sides. However, it will be docked on the left side, which is also the straightforward way.
After emerging from the water, continue to the far end and walk up the escalators.
Directly after this, we can take another set of escalators down.
This will lead directly to the spot where the boat is docked.
Hop in and start the engine 
and drive 
out of the mall and down some smaller rapids to escape. While you drive down the rapids, the next Chapter will begin.
This finishes Chapter 20: Road to the Aquarium in The Last of Us Part 2. Next is Chapter 21: The Flooded City.
For all other Chapter Walkthroughs, check out our full The Last of Us 2 Walkthrough.
There are 9 Parts you can pick up from a toolbox down in the water (on your way to the parking garage).
There’s a trading card in a cupboard that you have to get out of your boat to fetch inside a building
You get to draw after your boat journey gets blocked by a gate. Go up the stair and get the prompt
There’s an artefact on the same platform near the corpse
There’s a safe inside a cage when you have to lift a gate for the boat. Combo is 70-12-64
That’s all already in Chapter 21. They transition quite seamlessly 🙂
I also found 18 (I think) supplements in Rachel’s Fabrics 2nd floor.
Same, I found 18 supplements at Rachel’s Fabrics (Hard mode).
Yes also found 18 sup on the far end of the room on the sowing table.
the trading card before the rubble was the last card I needed for the Master Set trophy, on my first New Game+. this guide is the best
When you get to the destroyed building, just after that long muddy road (see screenshot above), there are 9 parts in the northeast part on a metal shelf. Or, from the workbench look to the top right corner, there is a dark room with the 9 parts (again, assuming you are on Hard mode).
In the same room as the trading card before the rubble, there are 6 parts to collect in the crawl space on the right
Apologies it.s already stated