 Bomb damage has made the corridor very dangerous, Mainwaring puts two dots on pieces of paper to determine who goes at the head of the human chain with Hodges picking the first of the two dots, Mainwaring pulls a blank piece but lies to stop the young Pike of having any chance of being at the front, they quickly shift the rubble to gain access to the trapped men.Once inside, Jones slams the door, thus bringing the roof down in the corridor, so trapping everyone except Jones, who is left outside.When Jones goes for help he breaks the handle of the outside door, so he is trapped as well.