There are a total of 5 collectibles (Flotsam) located throughout The Depths. Upon collecting all 5, you will unlock the achievement "Not Alone".

1 - While u are chasing the mysterious character in the beginning of the map u will end up in a room with a crate that can be dragged to a nearby sink. Do this, go inside the sink and grab the bottle before going down the rope to the next area.
2 - You'll reach a section where you use a lever to fill/drain a basin of water. Fill it to the top (100%), then drain it to 1/4 (25%). As the water is draining, jump in and swim to the right through a drain hole.
3 - Shortly after the second bottle you'll be crossing some water by jumping on some floating junk. Halfway through the room u will climb two silos and from there u can see the bottle on a platform on the right side. This bottle is obtained by jumping some more of the floating junk in the room.
4 - After crossing a large body of water, you'll reach a larg wall that you can climb. Halfway up this wall, turn back and jump onto the ledge behind you. With a running start, jump across to the left to find the collectible.
5 - After the final body of water (you'll use a TV to get across), you'll enter a room with a large staircase. Before going up, go to the right side of the room and find the bottle behind the planks on the wall.

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