With Indian Ocean countries still recovering from the devastating tsunami of 2004, Indonesia has launched a new warning system to protect it from similar disasters.
The terrifying sea surge triggered by an earthquake left an estimated 170,000 people dead or missing in Acech province.
The new alert system has been developed with the assistance of German experts. They have described it as the most advanced in the world.
It will use sensors placed on the seabed and shore to relay details of seismic movements to buoys on the surface.
Two out of ten buoys are alreay in place and the government says four more will be installed soon.
The aim is to deliver warnings within five minutes of an undersea tremor occuring.
But some experts say that cannot be achieved without the deployment of at least 22 bouys, and more tide guages and seisomographs.