Almost 1,000 kilometers off the Thai coast devastated by a tsunami 20 years ago, engineers lower a detection buoy into the waves — a key link in a warning system intended to ensure no disaster is as deadly again.
On Dec. 26, 2004, a magnitude 9.1 earthquake under the Indian Ocean triggered a huge tsunami with waves up to 30 meters high.
Only a rudimentary warning system was in place at the time, with no way to alert the millions of people living around the Indian Ocean in advance. More than 225,000 people were killed in a dozen countries.
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