Finding the Yellow VIP Keycard is extremely important. This is required to proceed further through the game. Although to get the VIP Keycard, you MUST have the maintenance Keycard to access this area. You can follow our maintenance keycard guide here.
Finding the VIP Keycard
First, you will need to get to this location on the map. It is located in the bottom left corner on the green icon. You can slide through the images below to have an understanding of this location. Please make sure you bring the maintenance keycard.
Cave Entrance for the VIP KEY
Once, entering inside the cave, you will see an airlock, open it and fall through. Make your way around the area and use the maintenance keycard on the door to gain access to a new room.

Here you will see a new room that is an underground greenhouse facility. Slowly take your take and advance through, there will be a few minor enemies.

In the second greenhouse room, you will notice some crossbow bolts on the wall and some blood on the floor. Follow this blood trail down the aisle and notice the guy on the floor.

Here you will be able to grab the mighty Crossbow on the floor next to the dead body. Now keep going through the rooms and tackling the enemies, until you notice the new double door that requires a keycard. Slowly go back on yourself and you’ll notice a doorway. Head through and you will come to a CCTV room.

There are two vital items in this room. One is the Yellow VIP Keycard, the other one is the Shotgun Rail attachment. Now you have the keycard, go towards the door and gain access to the big open room.

There is not much going on in this room except lots of interesting features to look at and lots of dead monsters. Thankfully, they don’t come to life.

You will see cracked glass, head towards this and you can jump into the water and find an underwater cave. Follow this pathway and this will lead you to the exit. There are a few enemies once you come out of the water.

Finally, you will now have the VIP Keycard and the Crossbow. You will be able gain access to practically anything now except the final Gold door.

Please see the Sons of the Forest Interactive Map here!