Coffin doesn’t take place entirely underground, but rather features a more familiar “ticking clock” scenario in which the protagonist has 75 minutes to get his wife out of the coffin before the air runs out and she dies.
The studio sums the premise up thusly:
A masked stranger reveals to Jack that his estranged wife and her lover are buried underground in a wooden box and their oxygen will run out in 75 minutes. He must engage in a dangerous game of cat and mouse with the masked stranger in order to save his wife…and himself.
Coffin stars Kevin Sorbo, Bruce Davison, Johnny Alonso, Patrick Barnitt, Sunny Doench, Moksha McPherrin, Candace Kita, Andrena Senola, Johnson Barnett and Luke Barnett. In the interest of full disclosure, it was written, produced, and co-directed by Kipp Tribble, who has written for Screen Junkies in the past, but has moved on and left the rest of us here to rot in the bowels of the Internet. Thanks, Kipp.