In Arknights: Endfield, the bit about finding a way to open the gate is a part of the Lone Wolf quest. It’s a simple puzzle that you have to interact with and solve in order to get past the locked gate and continue exploring the underground camp. Here’s how to complete it:
How to open the gate in Lone Wolf
Step 1
Firstly, make your way to the quest marker to look at the symbols on the wall.

You have to interact with these in a particular order.

Step 2
The puzzle is easy, but there are clues in the environment also. To find them, go straight ahead to the steps and the fog.

Step 3
Go past the fog and look for the arrows.

Follow the arrows.

Step 4
Go to the bridge. And look to the other side.

This is the sequence in which you should interact with the puzzle symbols.
Step 5
Basically, the answer is – Night, target, escape, foot-rest, and fire.

Or, put simple, 2-1-5-4-3.
Return to the wall and interact with the symbols in this order.
Step 6
Once you do it in the right order, the door will open.

And with that, you should be able to make your way ahead in the Lone Wolf quest. We hope this guide helped you solve the puzzle and open the gate. Until next time!