Understanding the mechanisms behind massive earthquakes to predict their magnitude and frequency requires conducting frequent measurements of seafloor movements with centimeter-level precision. However, with the currently available method, such observations call for traveling by ship to the target location, collecting data, and then returning--making it difficult to conduct measurements with sufficient frequency. Under these circumstances, Associate Professor Yusuke Yokota of #UTokyo_IIS throughout joint research with HAMA, Inc., has succeeded for the first time in the world in measuring the position of the seabed with centimeter-level precision using an unmanned aerial vehicle (UAV) that lands on the sea surface. This breakthrough technology is attracting attention for enabling more frequent and cost-effective measurements of seabed positions.