Based upon the Chilean mine disaster, where 33 miners were trapped underground for 69 days.
The 33 will likely be a great sound experience with lots of atmospheric sounds in the mine, as well as the collapse. This has lots of potential especially since Alan Rankin is the sound designer. His credits include Star Trek (2009) and Iron Man 3. Both sounded great. And Mike Prestwood Smith is a sound re-recording mixer, who is also credited with Casino Royale and Mission: Impossible – Rogue Nation.
Trailer 1 can be found at The 33 trailers page.