1. Ensure that the control of biochemical decompression room has been obtained, which requires teammates to successfully activate decompression equipment in biochemical mode.

2. Once the decompression device is successfully started, the timer next to the decompression hatch will start counting down and the countdown will be displayed on the screen.

3. During the countdown, it is necessary to protect the decompression hatch to prevent infected people from entering the decompression cabin, and use weapons and teammates to repel the enemy and ensure safety.

The door will open automatically as soon as the countdown is over. At this point, you can enter the decompression room to complete the task and continue the game.