Refinoc Biowaste Incident

On a November holiday at 1:00pm, Refinoc Biowaste Management at the Eisenhower Tunnel had an incident where the Internecion Cube (or Cubes) escaped containment and caused a lot of damage and mayhem. That incident could be the reason for why the tunnel was demolished in 2033. It's not known if Kirie's father, Hans, or anybody else died during the containment breach. While the exact date is unknown, Hans mentioned that it was a holiday and it was November. It also had to have happened before or during 2033 since the tunnel was demolished that year.

Expand to see speculative (non-canon) information Now we don't have an exact year, but we can narrow it down to a date with some assumptions. Assuming that: Then exact date & time is: Thursday Nov 24, 2033 1:00pm MST.
 * The incident caused the demolition of the tunnel within the same year
 * The November holiday was Thanksgiving day, not Veteran's day.