Cave

This movie left so many unanswered questions. However, I'm not sure I would bother watching a sequel to find out the answers. Who was following them? What cell phone company did the bad guy have to be able to get reception underground? Why wasn't this awesome ability the central plot of the movie? Was Victor and his dad serial killers? Did they lead people up to this cave and kill them? Is that one of their previous victim's tents in the cave? Who was the floating body in the water at the end? How come Charlie didn't go get any of their gear so she could survive? Did they really just have her splash around in a pool to imitate that she is in a torrent of fast water pulling her about? Who was the dead body in the back of the jeep? Did Charlie stab him since she stole his knife? Do the boyfriend and girlfriend really have no manners and have sex, not once but twice with her ex-boyfriend just feet away listening and watching? *sigh*