In Arc Raiders, Uncovered Caches present a high-risk, high-reward loot opportunity. These caches were buried Raider supplies that have now resurfaced due to storms. They contain useful items such as ammo, bandages, and sometimes rare blueprints or shield items. However, they are rigged to explode if they remain uncovered for too long.

Praise be to uncovered caches!!!
by u/Cyb3rcykd in ArcRaiders

Uncovered Caches Location

Uncovered Caches generally spawn in open or rural map areas. These include Buried City, Dam Battlegrounds, and Acerra Spaceport. You'll find them typically along dirt roads, or outskirts of town.

How to identify and loot Uncovered Caches in Arc Raiders

Via Reddit

Uncovered Caches look very much like loot crates or boxed with unique markings. You may hear ticking sounds near them, which indicates a timer for an explosion about to go off. So make sure to search and loot quickly before the cache detonates. In most cases, the loot will contain consumables and ammo, sometimes even blueprints (make sure to store them carefully in your safe pocket).