in the morning of april 13 the tunnel wall broke and water started coming in. the tunnels are below river level and filled up with water. twenty four older buildings connected to the tunnels. their basements started to flood. most had doors closed and locked but the doors were not waterproof. the city hall/county building had to move legal paperwork out of the basements. other buildings also saved things. the tunnels connected to two subways that were closed. some places not connected to the tunnels also flooded. a low part of an interstate highway also flooded. all electricity was turned off and the downtown was closed.