Players working through Line in the Sand in ARC Raiders need to explore several parts of Buried City while following clues connected to a robbery and stolen Exodus materials. The mission becomes much easier when the route is understood before entering the map. Preparing suitable gear is also helpful, and players who want additional options can buy ARC Raiders BluePrints before beginning their run. A flexible setup allows you to deal with unexpected ARC enemies while still keeping enough mobility for objective hunting.

The first destination is the derailed train near Warehouse and Piazza Roma. Look for the blue train cars that have been thrown off the tracks. Once you approach the correct section of the wreck, the investigation objective should update. This is a straightforward start, but players should avoid assuming that a quest location is completely safe simply because the objective itself is easy.

After the train investigation, move east toward the hilltop square tower. This area provides the next clue in the investigation. Near the southwest side of the tower, search around the bushes until you locate the detonator. Interact with it to discover the Marano Market Business Card.

The tower section can be a good example of how to approach quest objectives in an extraction shooter. Rather than rushing directly into an exposed location, take a moment to check nearby sightlines. Other Raiders may hear combat or movement and decide to investigate. If the area looks dangerous, wait for an opening before interacting with the objective.

The third stage requires players to trace the stashed thruster valves. Head north toward the Market Ruins, passing recognizable landmarks such as Library and Hospital. Continue toward the ruined building connected to the objective. Reaching the correct location is the main requirement, so there is no reason to search unrelated buildings once the quest has registered.

Inventory management becomes increasingly important during a quest like this. Players can easily become distracted by containers and materials while traveling through Buried City. Pick up useful resources, but avoid spending too much time looting when the primary goal is progression. Every additional minute inside a raid creates another opportunity for an ARC patrol or opposing Raider to interfere.

The final objective is located at Dune's End. Travel east and enter the merchant's apartment. Inside, locate the zipline and use it to descend into the basement. At the bottom, find the cardboard boxes associated with the investigation and take the required photograph. Once the objective registers, the main Line in the Sand route is finished.

Players who want to combine quest progression with other ARC Raiders activities can also learn more about the Blue Gate Harvester Queen encounter. The guide explains how to locate the Queen during the Harvester event and recommends using the nearby convenience store as cover. It also describes Deadlines, side armor weak points, and practical solo and squad considerations.

U4GM can help players who want a more convenient way to prepare for raids. Its ARC Raiders offerings are designed for players who want to spend more of their gaming time exploring maps, completing objectives, and experimenting with different loadouts instead of repeatedly building their inventory from scratch. Whether your focus is PvE, PvP, or general extraction, having appropriate gear can make each raid more flexible.

Ultimately, Line in the Sand is less about difficult combat and more about efficient navigation. Remember the four major stages: investigate the blue train, inspect the tower and detonator, trace the thruster valves in the Market Ruins, and photograph the boxes in the merchant's basement. With this route in mind, you can complete the investigation with fewer unnecessary detours and continue your ARC Raiders progression with confidence. For players building their long-term inventory, ARC Raiders buy BluePrints remain a useful part of preparing for future raids.