
A train with all the passengers disappears in the subway. Sometimes the sound of a passing train can be heard in the tunnels, but no one sees it. A young mathematician develops a theory: because of the opening of a new line, the train has fallen into another dimension.
6.7
7.1
6.0
6.1
6.9
6.0
6.3
6.8
6.0
6.0
7.5
6.8
7.2
7.1
6.7
6.0
7.1
7.3