A mega tsunami struck the Tracy Arm fjord in southeast Alaska on August 10, 2025, reaching a staggering height of 481 meters (1,578 feet) due to a massive rockslide at the South Sawyer glacier. This event, recorded as the world's second-tallest tsunami, serves as a critical warning about the dangers posed by climate change, which is causing glaciers to retreat and increasing the likelihood of coastal rockslides. The tsunami occurred early in the morning, narrowly missing several cruise ships that frequent the fjord. Researchers from the University of Calgary, led by geomorphologist Dan Shugar, noted that the landslide generated seismic waves equivalent to a 5.4 magnitude earthquake and triggered a 36-hour seiche in the fjord. The study highlights that without rapid glacier retreat, such a significant wave might not have occurred. With annual cruise passenger numbers in Alaska projected to rise from 1 million in 2016 to 1.6 million by 2025, the risks to maritime activities are increasing. The researchers advocate for stronger risk mitigation measures, including systematic monitoring of unstable slopes and improved tsunami modeling, to protect local communities and tourists from potential disasters.