Tonight's reconstructions of real-life rescues include a man who was overcome by fumes in an underground petrol tank.
Juliet Morris reports from Seattle, Washington, statistically the best place in the world to survive a cardiac arrest. Presented by Michael Buerk.
See today's choices.
(Stereo) (Subtitled)
999 Lifesaver Video Pack: please send a cheque for £9.99, payable to BBC Education, to [address removed]. There are 1,000 free life-saving courses on offer in Northern Ireland. Telephone [number removed], and reserve up to six places by, leaving your name, address and postcode. Calls cost no more than 50p.

999 9.35pm BBC1
There's an alarming story in tonight's episode of 999 that may prompt nervous parents to keep their offspring forever under lock and key. Martin and Sue Skinner bought their four-year-old son Sean a brand new sledge to take on holiday to the Cairngorms. On their first day out, Martin chose a gentle slope to launch Sean on his first run but with nightmarish rapidity, the sledge went out of control and sent Sean plunging through a hole in the snow into a freezing, fast-running stream. Local skiers rushed to help, digging in the snow with their bare hands - but there was little hope that Sean would emerge alive. Eventually, one of the diggers struck something small and warm. And mercifully for the Skinners, there was an off-duty nurse on the scene who managed to bring Sean back to life. Resuscitation skills are also the focus of a report from Seattle, where a public training initiative has resulted in a survival rate of 30 per cent after a heart attack - in Britain, where fewer people know how to save lives, the rate is around five per cent.