TV Guide BBC World Service Friday

Listener Christel watched a documentary about a volcanic eruption in 536AD that left her native Sweden under a cloud of ash for three years. She wants to know if and when such a thing could happen again. Anand Jagatia finds out about volcano prediction, travelling to the Philippines, which has more than 300 volcanos - 24 of which are listed as currently active. They include Taal volcano, which experienced violent eruptions in 2020 and has been active again this year

In parts of India, Jain monks belonging to the Digambara sect renounce all possessions, including clothes. These men walk naked for hundreds of miles across India as part of their spiritual journey. Rajesh Joshi explores this spiritual practice, learning about the dangers they face and asking villagers what they think of these disrobed monks whose numbers have unexpectedly grown in recent years