Roleplay series. Six children become Cadets at a hidden high-tech emergency response centre. The children must quickly assess and resolve a major emergency, under the watchful eye of mentor 'The Commander', weighing up interactive briefings and video field reports. A volcanic island in the Atlantic Ocean erupts, creating a mega-tsunami. A huge wave is heading for Europe and the UK. The cadets must deploy their forces to evacuate every town or village in the tsunami's path.