The Water Troubles quest is provided by Celeste, one of the vendors located in Speranza. She tasks you with gathering a contaminated water sample from ARC Raiders Coins the Dam Battlegrounds region so she can analyze it further.

Before entering the raid, it is important to prepare properly. Dam Battlegrounds is one of the larger and more dangerous maps in ARC Raiders, featuring open sightlines, elevation changes, and plenty of opportunities for ambushes from both players and ARC enemies.

Bringing a reliable mid-range weapon, healing supplies, and enough inventory space is recommended. Mobility tools such as ziplines can also make the journey significantly faster if you spawn far from the objective.

Where to Find the Flood Access Tunnel

The key to completing Water Troubles is locating the Flood Access Tunnel.
This hidden tunnel sits on the eastern side of the Dam Battlegrounds map, near the large red-colored lake. To reach it, players should travel east of the Control Tower and Research & Administration buildings.

If you are spawning from the western side of the map, expect a fairly long trek across the battlegrounds. As you move eastward, you will eventually overlook the Red Lakes area from a higher elevation point.

There are several ways to descend toward the lower section of the map:
Use the nearby staircases around the Control Tower area
Carefully move down the terrain slopes
Use a zipline for the fastest and safest descent

The zipline option is especially useful because it minimizes your exposure to enemy players and hostile ARC units.

Once you reach ground level near the red lake, begin searching the large concrete wall beneath the Control Tower. The Flood Access Tunnel entrance is built directly into this wall and can be difficult to notice from a distance.

The entrance itself has an industrial appearance and blends into buy ARC Raiders Coins the environment surprisingly well, which is one reason so many players overlook it during their raids.