Good luck if you watch this on DVD and take a break - the scene chapter thumbnails don't help too much!
Ok, so Paul keeps panicking and writing down numbers on the coffin lid. Dan Brenner the Aussie SAS-style hero is no help at all. Paul was told not to take the video, but when he is shown footage of a girl he knows taken hostage he panics and uses the camera phone.
He soon gets a call from Stephen Tobolowsky, head of his truck firm, who tells him that he has been terminated for fraternising with a fellow worker, which Paul denies, and he was effectively sacked that morning - so they won't pay the ransom from their insurance premiums.
Angry that no one has paid yet, Jabir (the nasty Arab guy on the phone), sends an MMS with footage of the female hostage shot in the head. Paul is devastated and considers killing himself.
Soon there's a snake (which looks like a Black Mamba) which somehow crawls down his T-shirt - and then down his trouser leg. Paul burns it with the lighter and it escapes back out the side of the coffin, which he then blocks up. So, it's clearly not buried that deep then.
Suddenly Paul can hear explosions above ground - and sand starts to enter the coffin from the broken lid. Usually this would be the chance to get out - he doesn't even need to do that Kill Bill inspired one-inch punch to break the boards now.
Paul tries to phone Jabir, but can't get through. He reaches Dan Brenner, and hears that F16s have bombed the area - so surely they know where he is. With Jabir dead, Paul fears that he can not be found. He phones his answering machine again, and his mum who suffers from dementia, to say his goodbyes.
Soon he hears again from Jabir. He's alive! He wants footage of Paul chopping off his finger now, and he won't harm his family in the US - even though Jabir is clearly in Iraq. Paul calls Brenner, and he tells them they are on the case.
With the coffin filling up with sand, Paul cuts off his finger and sends the video. He soon gets a call from Brenner - they've picked up an insurgent who is going to lead them to the coffin. They'll be there in 3 minutes - Paul just needs to hang on.
Almost out of room Paul receives a call - it's Brenner - they're almost there! They're digging him up now - he hears they're about to open the coffin .... and then "Oh no - it's Mark White. I'm so sorry". It's the other hostage, the one Brenner lied and said had got away.
Paul is left to die.