1Libyan exile and international aquatic science consultant talks about the state of affairs in his home country. Ibrahim Elmetri grew up and was educated in Tripoli, Libya, and left in 1984 as a 23-year old as he was unable to work within the regime. He now works as an international aquatic sciences consultant, based in New Zealand.

2The principal scientist with GNS Science, and project leader of the team that has been 3D mapping the bottom of Lake Rotomahana, near Rotorua talks about finding the remains of the Pink, and eventually parts of the White Terraces. The research at this time depended on the availability of specialised and sophisticated pieces of equipment like robotic underwater devices. They only had 10-days to complete the investigation at the site, and this was weather dependent.

3Platon is staff photographer for The New Yorker magazine, and has contributed to a large range of international publications including TIME, Vanity Fair, Esquire, Rolling Stone and the New York Times Magazine. Staff photographer for The New Yorker magazine, whose new book, Power, is a collection of intimate portraits of over 100 world leaders.

4Martin Nowak: co-operation Professor of Biology and Mathematics at Harvard University. He is co-author of "Super Co-operators: Evolution, Altruism and Human Behaviour "(or Why We Need Each Other to Succeed).