TL;DR
- The Maintenance Keycard unlocks critical underground facilities and progression areas
- Three essential tools (Rope Gun, Rebreather, Shovel) must be acquired first
- Keycard location requires digging at a specific marked site west of the shovel cave
- Prepare for mutant encounters and bring adequate weapons before attempting retrieval
- Additional valuable items including a 3D Printer are found in the same underground room
Securing the Maintenance Keycard represents a pivotal progression milestone in Sons of the Forest, granting access to previously inaccessible underground facilities scattered throughout the island. This essential security clearance item functions as your ticket to advanced areas containing crucial story elements, rare resources, and powerful equipment that significantly enhance your survival capabilities.
The island contains multiple secret underground complexes and maintenance tunnels that remain locked without proper authorization. The Maintenance Keycard serves as your primary access credential, enabling exploration of these restricted zones where valuable loot and narrative progression await determined survivors.
Attempting to acquire this item prematurely will prove futile, as the journey requires specific tools and preparedness for dangerous encounters with both cannibal tribes and mutated creatures that patrol key locations.
Before embarking on your Maintenance Keycard retrieval mission, you must secure three critical tools that enable navigation through the island’s challenging terrain and underground networks. Each serves a distinct purpose in overcoming environmental obstacles.
Activate your GPS Tracker by pressing the “M” key to visualize waypoints and orient yourself. For navigation consistency, establish the mountain range as your northern reference point regardless of character orientation fluctuations.
- Rope Gun (Zipline Gun) – Located in a cave positioned slightly south of the river flowing from the central mountains to the coastline. This cavern is identifiable by a distinctive pile of skulls containing the Stun Baton. The Rope Gun enables traversal across otherwise impassable gaps through zipline deployment.
- Rebreather – Found exclusively in the solitary beachside cave along the coastline. This breathing apparatus permits extended underwater exploration, accessing submerged passageways essential for progression.
- Shovel – Situated within a mutant-infested cave proximal to the mountain region. Navigate to the tunnel system’s terminus to claim this digging implement.
Left: The cave that has the Rope Gun/Zipline Gun (the cave with the Shovel is also noted); Right: The far end of the tunnel system where you can pick up the Shovel.
With the Shovel secured, navigate to the green GPS marker positioned west of the shovel cave location (maintaining the mountain-north orientation reference). This destination features distinctive landmarks including a blue golf cart and excavatable soil patches indicating the dig site location.
Utilize your Shovel to unearth the concealed hatch, then descend the revealed ladder into the underground maintenance area. Immediately upon entry, locate the compact office chamber to your right where multiple valuable items await collection.
Left: Maintenance Tunnel A; Right: The Maintenance Keycard on a desk with another 3D Printer.
The Maintenance Keycard rests prominently on a desk alongside an additional 3D Printer, providing both access authorization and manufacturing capability in a single location. This efficient placement minimizes backtracking and maximizes resource acquisition during your expedition.
Seasoned players recommend completing the equipment acquisition circuit in reverse geographical order for optimized travel efficiency. Begin with the beachside Rebreather, proceed to the mountain-proximal Rope Gun, then secure the Shovel before proceeding to the keycard location.
A critical mistake many newcomers make involves underestimating mutant presence in the shovel cave. Equip superior weaponry like the Stun Baton discovered earlier and consider bringing healing items to manage encounters effectively.
Navigation represents another common challenge. The constantly rotating map can disorient even experienced players. Establish consistent landmark references beyond the mountain-north convention, such as distinctive coastline formations or unique vegetation patterns.
For advanced optimization, experienced survivors suggest completing this sequence during daylight hours to maximize visibility in dark caves and reduce ambush risks from nocturnal threats.
Action Checklist
- Acquire Rebreather from the solitary beach cave
- Retrieve Rope Gun from skull-marked cave south of mountain river
- Secure Shovel from mutant-infested mountain cave
- Navigate to green GPS marker west of shovel cave
- Excavate hatch site and descend into maintenance tunnel
- Collect Maintenance Keycard and additional items from office room
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