Since it says '12 feet deep based on true story', it could be a story related to a construction accident where a trench or a pit was 12 feet deep and something extraordinary happened there. It might also be a story about a discovery made at a 12 - foot depth, like an archaeological find or a geological phenomenon. The fact that it's based on a true story implies that there are real - world roots to this narrative, and the 12 - foot depth is likely a central aspect that gives the story its uniqueness and perhaps its sense of danger or mystery.
Well, '12 feet deep based on true story' might refer to a narrative that revolves around a particular event or series of events where the depth of 12 feet is crucial. Maybe it's about a rescue operation where someone was trapped 12 feet underground or underwater. Since it's based on a true story, it could be inspired by an actual incident that happened to real people, and the creators decided to tell that story, highlighting the 12 - foot depth as a key factor in the plot.
I'm not entirely sure specifically about the '12 feet deep' story. But generally, when a movie or story is 'based on a true story', it means it has some elements that are drawn from real - life events. It could be about a situation where something was 12 feet deep, like perhaps a hole, a body of water, or some other physical depth that was significant to the real - life events it's based on.