Young cyclist Janina is in cardiac arrest after an accident, doctors fight to stop Tony from bleeding to death and 11-year-old Blake is left with a serious head injury after being hit by a car.

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This episode explores the life-or-death decisions facing doctors and midwives as they battle with neonatal emergencies. Based in a specialist maternity unit, it follows three babies, minute by minute, second by second, as frontline midwives and neonatologists fight to keep them alive through the critical first hour after birth.

The cameras follow medics as they battle to save a young man who's been injured in a car crash.

Moped rider Martin is fighting for his life after a collision with a lorry in London. Doctors are concerned have may have severe head and spinal injuries after the wheel of the lorry pressed against his head.

In Bristol, Christy is hit by a car. Doctors suspect she may have bruising to the front and back of her brain and give her an emergency roadside anaesthetic. In hospital, her brain begins to swell rapidly and she undergoes an emergency operation.

Fitness trainer Dusan is in critical condition after being hit by a bus. In hospital, he is declared a code red and receives immediate blood transfusions.

Michael collapses at work with a suspected cardiac arrest. Doctors must work out whether issues with his heart or a brain haemorrhage caused the collapse.