A 481-meter megatsunami hit Alaska in 2025 after the collapse of a mountain without glacial support, forced six cruise companies to alter routes, and alerted scientists about global risks linked to melting ice.

Written by Andriely Medeiros de Araújo

Published on 08/05/2026 at 09:47

Updated on 08/05/2026 at 09:48

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A 481-meter tsunami hit Tracy Arm fjord in Alaska. Learn how glacier retreat caused the wave and why cruises had to change their routes.

The tourism industry in Alaska faces immediate operational changes after a colossal tsunami hit Tracy Arm fjord in August 2025. The phenomenon, which reached a height of 481 meters — equivalent to 1.5 times the Eiffel Tower — forced about six cruise companies to seek alternative routes to avoid new risks.

According to UCL, the disaster was caused by the collapse of a mountain that, without the support of a retreating glacier, discharged a mass of rock equivalent to 24 Giza Pyramids into the region’s waters, surprising scientists and visitors.

Operational Impact and Survival in Tracy Arm

Safety became the top priority after the event occurred at 5:30 AM. Although the gigantic wave did not directly hit any large vessel, the waters became extremely turbulent, as reported by crew members of a cruise ship anchored at the fjord’s entrance.

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Warning signs: Earthquakes and rock stability

The study led by Dr. Dan Shugar revealed that, although the collapse showed no obvious visual signs in the preceding weeks, nature issued invisible warnings. Frequent small earthquakes were recorded in the days leading up to the landslide, indicating that the mountain’s structure was under critical stress.

Unlike other avalanches, this one did not present the common superficial cracks. Technical analysis points to crucial factors:

Mass Volume: The fall was estimated on a monumental scale, compared to the weight of dozens of pyramids.

Loss of Support: A glacier supporting the mountain’s base retreated 500 meters in a few weeks.

Absence of Visual Warning: The event occurred without the traditional signs of falling debris.

The science behind the wave and climate change in Tracy Arm, Alaska

Experts are emphatic in linking the emergence of this monumental wave to global warming. Dr. Stephen Hicks, co-author of the research, explains that the accelerated ice retreat leaves previously stable areas on the “front line” of danger.

As tourism in these glacier regions has grown significantly, the risk to people has become real and immediate in areas previously not labeled as dangerous.

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Therefore, the focus now is on implementing modern monitoring systems. Researchers suggest that investing in technology that identifies previous seismic tremors can offer a warning window of hours or even days for evacuations and ship maneuvers.

With information from the website Aventuras na História and UCL

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A 481-meter megatsunami hit Alaska in 2025 after the collapse of a mountain without glacial support, forced six cruise companies to alter routes, and alerted scientists about global risks linked to melting ice.

A 481-meter tsunami hit Tracy Arm fjord in Alaska. Learn how glacier retreat caused the wave and why cruises had to change their routes.

Operational Impact and Survival in Tracy Arm

Warning signs: Earthquakes and rock stability

The science behind the wave and climate change in Tracy Arm, Alaska

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A 481-meter megatsunami hit Alaska in 2025 after the collapse of a mountain without glacial support, forced six cruise companies to alter routes, and alerted scientists about global risks linked to melting ice.

A 481-meter tsunami hit Tracy Arm fjord in Alaska. Learn how glacier retreat caused the wave and why cruises had to change their routes.

Operational Impact and Survival in Tracy Arm

Warning signs: Earthquakes and rock stability

The science behind the wave and climate change in Tracy Arm, Alaska

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He transformed an abandoned plastic water tank into an underground house in the “hobbit hole” style, using only repurposed pallet wood, without heavy machinery or expensive labor.

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China transforms desert-devastated area into the world’s largest artificial forest, planting trees for 60 years, blocking sand that reached Beijing, and creating a “green lung” of 92,000 hectares in a region once considered lost.

China has deployed snake-shaped robots to slide along power lines, where they have already inspected over 130 kilometers of cables using cameras and sensors to detect damaged wires, worn-out parts, and overheating.

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