The initial episode finds a retired nursery teacher facing peril as she strives to reach her two dogs, stranded by the encroaching tide. In Wales, a volunteer is swept from a cliff into the sea during an attempt to rescue a spearfisherman s…

A call goes out to the volunteers: two students have plunged into the River Thames, stark naked, under the influence of LSD.

A call goes out to the volunteers: a fishing vessel lies wrecked, grounded in the heart of a raging storm, and its crew is in peril.

A call goes out to the volunteers: a father, attempting to save his son, has found himself in peril and requires rescue.