Tunnel, as the name says is a survivor-thriller about a man caught inside a collapsed tunnel. The casting has been done so perfect and particularly the leads Ha Jung Woo and Oh Dal Su nails it! Every detail portrayed in the movie is meticulous. I personally didn't feel any negatives from the movie expect a tad bit of feeling that it could have been delivered even more seriously with in-depth details. Easily one of the best in the recent times!