Four teenagers at a British private school secretly uncover and explore the depths of a sealed underground hole created decades ago as a possible bomb shelter.

At an elite girls boarding school, the award winning diving team is considered the premier group of girls in the school. When a new girl from Spain, Fiamma, comes to the school and joins the team, the rest of the squad is jealous of her relationship with the coach and force her off the team and out of the school by bullying her. When the girl is forced to rejoin the group, they decide to let her into their social circle and begin to be as fascinated with her as their coach is. But things take a turn when the coach lets her fascination lead her too far.

One misty morning, Liz Dunn stumbles down the road to her school and screams for help. A police psychologist gets her to reveal her story: A month earlier: three rebellious teenagers - Mike, Frankie and Geoff are trying to ditch the school field trip to Wales. The school nerd Martin helps them out by allowing them to stay in an old war bunker for the three days on the condition that his friend Liz joins them. The teens go down, party and have great fun but Martin doesn't return to let them out and they hope and pray that someone will find them...

At an elite girls boarding school, the award winning diving team is considered the premier group of girls in the school. When a new girl from Spain, Fiamma, comes to the school and joins the team, the rest of the squad is jealous of her relationship with the coach and force her off the team and out of the school by bullying her. When the girl is forced to rejoin the group, they decide to let her into their social circle and begin to be as fascinated with her as their coach is. But things take a turn when the coach lets her fascination lead her too far.