Sons of the Forest Maintenance Key card (Image credit: Endnight Games) You'll need to start with the Sons of the Forest maintenance key card as it opens the door to the next card location.

Find the maintenance, VIP, and guest keycards by exploring the bunkers in Sons of the Forest. These keycards will let you explore the island further.

To access everything on the island in Sons of the Forest, you’ll need to find keycards. When exploring the vast island, you’re bound to discover strange underground bunkers.