Professor Peter Wadhams is an expert on sea ice at Cambridge University. In this conversation with Professor Franklyn Griffiths, Dr. Adele Buckley, Dr. Pia Wadhams (his wife), and Metta, he discusses the alarmingly rapid melting of the methane hydrate crystals (clathrates) at the bottom of the Siberian sea in the Arctic Ocean. These deposits have a permafrost "lid" locking them down, but global warming is puncturing the permafrost and releasing plumes of methane, which is more than 20 times as powerful a greenhouse gas as carbon dioxide. Wadhams considers this as currently the most serious threat to humankind's survival. We talk of various proposals for solving the problem, none of which are well established as effective.