FAR-FLUNG LOCATIONS

Earth’s Natural Wonders, 9pm, BBC1

THE third and final episode follows the Zermatt air rescue helicopter team patrolling the Swiss Alps in search of people in perilous situations. Plus, we meet villagers in the Tigray region of Ethiopia — who regularly climb a vast, vertiginous mountainside, just to reach their church — and visit the rice fields of Laos, where unexploded bombs from the Vietnam War still present a constant danger.