Generally, the story goes like this: the captain asked Gates to open the basement door, and the door opened. The captain called everyone in and went upstairs to stop the invading enemy.

There may be three reasons for getting stuck:

1, the captain let everyone in, and the protagonist (himself) did not go upstairs after entering the basement; Solution: Go upstairs and clean up the enemy after entering.

2. Using cheaters leads to memory errors that do not trigger the plot; Solution: Turn off the cheater and re-enter this level from the previous level.

3. The original bug of the game version caused it. Solution: Download the latest optimized version, delete the archive and play again.