Tunnel (Blu-ray release 2017-5-19) is a Korean disaster movie about a man who gets trapped in a tunnel.  This movie is distinctly different from Hollywood disaster movies, and is more focused on character and social satire.  So there is less excitement and tension here, but people who prefer drama may like it.  Although I think this is a good drama, there are certain things which are really unrealistic, such as how long the smartphone battery lasted.  (Although disaster movies are always unrealistic, in this particular case this factor is more important than other brainless ones that exist only to show off visual effects.)