A formation used to restart play after a minor infraction such as a knock-on or forward pass. Forwards on each side bind and the two groups come together, with the front rows interlocking to leave a tunnel between them. The scrum-half (#9) of the non-offending team feeds the ball into the tunnel midway between the front rows. The hookers attempt to get the ball back by ‘hooking' it with their feet, while the other players try to push or ‘drive' the opponent backwards. The scrum ends when the ball is out of the tunnel and in possession of a player on either team. As with a ruck, a player may not use his/her hands while the ball is in the scrum.