Disasters happen. Some are natural and some we bring about ourselves. To be able to prevent them we must first understand how and why they happen and develop technologies to help us deal with them. XLab this week introduces us to a scientist who is studying how to build structures which can withstand the effect of earthquakes, a scientist who is building an airplane of the future and an oceanographer who monitors sea currents. In the studio Stelios and the students construct a volcano!