It is an automatic system which uses multiple cameras to create a 3D model of the goal and if the system detects the ball has crossed the line in the model it triggers an automatic alert to the referee. There are no teams looking at videos unlike VAR.
Can only assume from the Hawkeye...
One thing I really did not like was the water breaks as it is yet another break in play and is being used as an additional opportunity for managers to get across changes in tactics that otherwise they would not have been able to. Can see these being disruptive especially if you are on top in a...