Thalassa: Edge of the AbysS
Walkthrough Sections
Welcome to the Into Indie Games walkthrough for Thalassa: Edge of the Abyss.
For more information on Thalassa: Edge of the Abyss beyond this walkthrough, check out the official website.
Table of contents
Prologue
After the opening conversation, you will be tasked with seeing Kaymar about the cradle.
Exit the Locker Room by going through the door past all the green lockers.
Go down the corridor and follow the signs to the Main Hall downstairs.
Approach Kaymar and interact with him to talk to him.
We should now start picking up clues in the Main Hall, with the objective of finding a reason to go on a dive before the cradle is ready.
Clues in the Main Hall
- Expedition Display (near the glass wall)
- St Catherine Cargo (display case, behind the expedition display)
- Painting (framed on wall, behind the expedition display)
- Digsite 1 plan (framed on wall, behind the expedition display)
- Goddess Thalassa (framed on wall, behind the expedition display)
- St Catherine Artefacts (display case, behind the expedition display)
Now go to the door leading to the staircases behind the glass wall.
There’s nothing to do upstairs, so go downstairs to the Living Area.
Clues in the Living Area
- Important Instructions (paper on corkboard to your right as you come down the stairs)
You can pet Poly the cat, who’s resting in a hammock in a corner of the living area, for an achievement.
When you’re ready, enter Cam’s cabin.
Investigate the Dive Details on the table to pick up a mandatory clue and also gain your first mystery.
This is the only mystery in the Prologue of the game, and we can’t solve it until we have all the necessary clues.
You can also inspect the picture next to the porthole, but it’s not a clue.
Exit Cam’s cabin and enter Alex’s cabin, which is right next to Cam’s.
Clues in Alex’s Cabin
- Crate of Materials (on the table)
Non-Clues in Alex’s Cabin
- Alex’s Mother’s Photograph (framed, on the table)
- Alex’s Mom’s Necklace (hanging from the blackboard)
- Stuffed Elephant (on the bunk, opposite the cupboard)
You should now have enough clues to solve your first mystery.
Mystery: The New Dive Order
A Promising Lead: Interesting Piece
Which Site?: Digsite 3
Details on Priority: Goddess Thalassa
Owner’s Priority: Isabel Instructions
Armed with this new knowledge, head back up the Main Hall, where you can watch a conversation between Kaymar and Thomas.
When you’re ready, return to the Locker Room.
Head out onto deck and approach Bailey, then interact with him to talk to him.
This will trigger a lengthy sequence, at the end of which you’ll find yourself on the sea floor.
Follow the flares Bailey drops down.
Eventually you’ll reach Alex – approach her to find that she’s trapped under debris.
Here, if you want to go for the ‘Heartless’ achievement, ignore Alex’s pleading and allow her to die.
Otherwise, you can attempt to save her by cutting the ropes.
Another lengthy sequence follows after this.
Bailey’s Boat & Sea Floor
In the next segment, walk past the shadowed scenes until you get to the last one.
Once you wake up, examine the newspaper with the headline “SS Thalassa Sinking” to get a mandatory clue.
Examine the magazine for another mandatory clue.
Finally, interact with the green wine bottle.
Cam can finally get up now, and you’ll be presented the Mystery Tree, where you can see all the mysteries of the game.
Clues in Bailey’s Boat
- Thalassa SOS (note on the left of the corkboard)
- Nautical Map (below the portholes, near the steps)
Non-Clues in Bailey’s Boat
- Pile of Letters (on the desk to the right)
- Spice rack (just above the kitchen counter, opposite the stairs to the upper deck)
- Book (on the bunk below the stairs to the upper deck)
Let’s solve your second mystery of the game.
Mystery: Thalassa’s Last Days
When did they sink?: Thalassa SOS
How long was the journey?: Voyage Plan
Head out onto deck and approach Bailey, then go to the lift when he instructs you to.
Once you’re at the bottom, follow the fairly linear path.
When you come across the dresser, interact with it to open a drawer.
Continue down the linear path. You’ll get to some metal debris – interact with it to cut the chains.
Proceed to find the cradle, which will grant you a mystery that you can only solve later in the game.
Opposite the cradle is a path that goes through some caves, but doesn’t seem to be useful in any way.
Instead, head toward the loose pipe and interact with it to undo the bolts.
Keep going to find the SS Thalassa.
Proceed going down the path, over the ledge, and open the door to enter the ship.
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