In the most earthquake ready country on earth – Japan - a massive tsunami in 2011 hit two schools in Kamaishi and Okawa. At one everyone survived; at the other 74 children were killed. What went wrong?

We hear gripping contributions from pupils at both schools, including Mai Ogasawara and Tetsuya Tadano; location recordings from Mai Nishiyama and Yu Wada Dimmer on the aftermath of the giant wave; plus interviews with Richard Lloyd Parry, author of Ghosts of the Tsunami and Robert Muir-Wood, author of the Cure for Catastrophe.

(Photo: Cherry blossom covers trees amid tsunami devastation in Kamaishi City, 2011. Credit: Yasuyoshi Chiba/AFP)