Still visible today are the ruins of the Gleno dam in Bergamo, Italy. Start of building was in 1916 and it was planned a curved gravity dam. For cost reasons, during the construction phase in a brick arch dam was changed. Before this was approved (there were static concerns), the dam was already built and half of the construction costs saved. A construction freeze made by the Italian state was ignored. Already in 1920 warnings about shortcomings in planning, bad building materials and building bungles were ignored and the critics fired. On the morning of December 1, 1923, after heavy rainfalls, which filled the dam to the overflow, broke columns and the wall partially collapsed.
Within minutes, an estimated 5,000,000 m³ of water, mud and debris flowed from the reservoir into the valley below. The village of Bueggio was first flooded, followed by a partial flooding of Dezzo, part of the municipality of Azzone, and the complete flooding of Dezzo, a hamlet of Colere and Corna di Darfo. Only Lake Iseo stops the mass of water after about 30 kilometers. At least 356 people (according to other sources up to 600) were killed in the disaster.
The big Halifax explosion was already posted in the oGEC. When on December 6, 1917, the French ammunition freighter MONT BLANC collided with the Norwegian ship IMO, the MONT BLANC, fully laden with about 2,500 tons of explosives, caught fire and exploded at 9:04. It was one of the most violent non-nuclear explosions in history. It is considered the world's largest accidental man-made explosion, killing up to 2,000 people and injuring 9,000 and razing large parts of Halifax to the ground. Even today, artifacts can still be seen. The more than a half-ton anchor shank of the MONT BLANC was about 4 km far and a cannon part about 2 km far flung. Both can still be seen today. In the Maritime Museum of the Atlantic Halifax you can see more parts of the almost completely torn MONT BLANC. The Halifax City Hall clock is constantly at 9 o'clock and 4 minutes.
And if the saw clamps when cutting old trees in Halifax, it's metal shards...