Alaska Megatsunami Nearly Hits Tourist Ships — A 500m Wave Close Call
A towering wall of water, nearly half a kilometer high, surged through a remote Alaskan fjord and the world is only now grasping how close this came to disaster.
Scientists have confirmed that a massive “megatsunami” struck southeast Alaska in August 2025, making it the second largest ever recorded. The wave, reaching close to 500 meters in height, was triggered when an enormous section of a mountain suddenly collapsed into a narrow fjord. In less than a minute, tens of millions of cubic meters of rock plunged into the water, displacing it with explosive force and sending a colossal wave racing through the valley.
What makes this event especially alarming is not just its size, but how narrowly catastrophe was avoided. The tsunami struck in the early hours, when the fjord was empty. But this same location is a popular route for cruise ships and турист vessels. In fact, ships carrying thousands of passengers had passed through just hours earlier and more were scheduled to arrive later that same day. Experts are calling it a “close call” that could have turned deadly.
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Megatsunamis like this are different from the ocean-wide tsunamis most people think of. They are usually caused by landslides rather than earthquakes and while they don’t travel across oceans, they can be far more intense locally. In confined spaces like fjords, the energy has nowhere to go, so the waves rise to extreme heights and strike with devastating force.
Now, researchers are pointing to a deeper concern. Climate change appears to be playing a role. As glaciers retreat, they remove the natural support that once held mountainsides in place. Without that icy stability, rock faces become vulnerable, increasing the risk of sudden collapse. Scientists warn that these types of events may become more frequent, especially in regions like Alaska where steep terrain and melting ice intersect.
The implications go beyond one remote location. Tourism in these fragile environments is growing and so is the risk. Cruise routes, local communities and critical infrastructure could all be exposed to similar hazards in the future.
This was a rare moment where timing prevented tragedy. But experts are clear, luck is not a strategy. Monitoring systems, better risk assessments and greater awareness will be critical in the years ahead.
Stay with us as we continue to track this story and bring you the latest developments on the growing risks linked to our changing planet.
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