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  1. Games
  2. Third Person Shooters
  3. Arc Raiders

A Line in the Sand's clues are incredibly unhelpful in Arc Raiders, so here's what you need to do

Guides
By Leon Hurley last updated 1 May 2026

Where to find the train, thruster valves and basement to complete this vague quest

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arc raiders a line in the sand
(Image credit: Embark Studios)
Jump To:
  • Find out why the train never reached Marano Station
  • Find out who orchestrated the robbery
  • Find out where the thruster valves were stashed
  • Where to search the basement of the merchant's apartment
  • A Line in the Sand rewards
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The Arc Raiders Line in the Sand quest sends you to Buried City to look for a train, thruster valves and basement. That doesn't sound that hard except nearly all the locations are not particularly near where you're told to go, if you're given any sort of coherent clue at all. To help you avoid the pain of scouring the place I've got all the details and locations here, to help you clear this mission quickly.

This is part of a group of Riven Tides quests and is followed up by the Arc Raiders Safe Harbour mission, alongside Shoring Up Defenses, and Battening Down which I can also help you with if you're having trouble.

Find out why the train never reached Marano Station in Arc Raiders

Find out why the train never reached Marano Station Arc Raiders location

(Image credit: Embark Studios)

The first part of Line in the Sand sees you trying to find out why the train never reached Marano Station. The important thing here is to not go to Marano Station. There's nothing there that to help you, so instead, head south west of there to the location shown on the map above, where you'll find a derailed train:

arc raiders a line in the sand train

(Image credit: Embark Studios)

Get to the right point on the train wreckage and you'll update the objective and get a new one to find out who was responsible what's happened.

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Watch full video here:

Find out who orchestrated the robbery in Arc Raiders

Find out who orchestrated the robbery Arc Raiders location

(Image credit: Embark Studios)

Finding out who orchestrated the robbery is tricky because there's no clear or useful clue to follow. Instead you you just sort of have to wander around and hope you get lucky. To save you that indignity just go and check the small, partially buried tower at the location on the map above.

arc raiders a line in the sand tower

(Image credit: Embark Studios)

When you reach the tower climb up into it and you'll find a bush you can search to get a clue: a Marano Market Business Card, that will direct you to the next objective.

You may like
  • Arc Raiders batten the hatches Battening Down Arc Raiders quest guide
  • arc raiders a line in the sand Safe Harbour Arc Raiders quest guide
  • Arc Raiders wrench in the works Wrench in the Works Arc Raiders guide

Find out where the thruster valves were stashed in Arc Raiders

arc raiders a line in the sand Find out where the thruster valves were stashed

(Image credit: Embark Studios)

The Marano Market Business Card is an actual useful clue that directs you to the market ruins east of the hospital. This is one of the easier steps as a result, and once you reach the ruined buildings you should see the quest update.

arc raiders a line in the sand

(Image credit: Embark Studios)

This new objective, to search an apartment basement, is another one that isn't that obvious however. And, unhelpfully, it's nowhere obviously near where you currently are.

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Where to search the basement of the merchant's apartment in Arc Raiders

arc raiders a line in the sand basement of the merchant's apartment

(Image credit: Embark Studios)

Finding the basement of the merchant's apartment in Line in the Sand is probably the trickiest bit. You basically have to head to the location shown on the map above and look for this doorway:

arc raiders a line in the sand

(Image credit: Embark Studios)

Head in there and you'll find a zipline down to the basement and, as soon as you enter the larger room you'll see some boxes to your right. Approach them to get a prompt to take a picture and you'll have everything you need to turn the mission in. Now just extract and go see Celeste.

Arc Raiders A Line in the Sand rewards

arc raiders a line in the sand rewards

(Image credit: Embark Studios)

Once you've completed A Line in the Sand visit Celeste to hand in the mission and claim the following rewards:

  • Exodus Modules x2
  • Magnetic Accelerator x2
  • Magnetron x2

That's actually a pretty good haul of high level crafting stuff so worth the pain of getting through that baffling collection of unrelated locations.

© GamesRadar+. Not to be reproduced without permission.

CATEGORIES
PC Gaming PS5 Xbox Series X Platforms PlayStation Xbox
Leon Hurley
Leon Hurley
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Managing editor for guides

I'm GamesRadar's Managing Editor for guides. I also write reviews, previews and features, largely about horror, action adventure, FPS and open world games. I previously worked on Kotaku, and the Official PlayStation Magazine and website.

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