Lee Jung-soo
Se-hyun
Dae-kyung
Captain Kang
Mi-Na
Chief Choi
Soo-jin
Minister
Reporter Jo
Government Official
Young Rescuer
Driller Captain
Drone Technician
Public Hearing Moderator
Old Mother
Construction Worker
Employee of Korea Expressway Corporation
Driller
SNC Reporter
A man is on his way home when the poorly constructed tunnel he is driving through collapses, leaving him trapped leaving himself for the unexpected whilst emergency services struggle to help.