The five-day exercise simulates catastrophic floods from a "water bomb", an ever-present fear in a country where 60 percent of people live below sea level and climate change is making things worse.
The operation, bringing together the military, crisis planners, and local water authorities, tests responses to 200 millimetres of rain falling in one day -- a quarter of the annual amount in the Netherlands.
Such a scenario would be similar to the floods that devastated western Europe in 2021, with nearly 200 deaths in Germany and 40 in Belgium. No one died in The Netherlands but large areas were flooded.
"Dutch people, when we are born, we know we're going to fight the water," said commanding officer Corporal Michel Vrancken.
The military are always learning to fight the enemy, but "Dutch people know that water can always be an enemy," the 25-year-old told AFP, as his unit piled up sandbags behind him.
Vrancken's team is training to deploy an innovative mobile dam that could slow damaging floodwaters -- part of the exercise.
Out of necessity, the Dutch have become world leaders in managing water and floods.
If nature had been left to take its course, most of The Netherlands would be a muddy swamp, not the European Union's fifth-largest economy.
The country is essentially a large delta crossed by three major rivers, the Rhine, Schelde, and Maas, that flow into the unpredictable North Sea.
Without sound defences, 60 percent of the country would be regularly flooded, according to the government. That would affect some nine million people.
"If we want to stay in this country, we have to" learn to prevent flooding, said Marian Booltink, crisis coordinator at the local flood management association, who is supervising Operation Cloudburst.
"Climate change is affecting my work because we now know we will have more crises because it's too dry (drought) or there's too much water (flooding)," the 59-year-old told AFP.
- 'Don't underestimate water' -
Overseeing water levels and flood defences across the country is Bart Vonk, Chair of the National Coordination Committee during Flood Threats.
"The impact of water on a person is immense," the 64-year-old told AFP from his office, surrounded by big screens showing real-time national water data.
"What I've learned in my career is don't underestimate the force of water, but also don't underestimate the impact on people when their house is flooded," said Vonk.
Vonk and his team ensure the country is ready for extreme scenarios: a drought meaning all inland shipping is beached or a devastating storm surge.
The Dutch are bringing innovation and the latest technology to bear on a centuries-old problem.
Drones inspect dykes and levies, producing data then crunched by AI to identify weaknesses.
Another innovation: "Green eggs" or devices that listen for beavers, whose digging can be devastating for flood defences.
What is the secret to the Dutch success?
"We stay very proactive," said Vonk.
"You have other countries that are reactive, they accept an incident. In the Netherlands, we can't accept it because the consequences are too high."
However, he said the Dutch have also learned much from other countries, notably about recovery from major floods.
Vonk acknowledges that climate change is making his job "more and more challenging."
Glacier melt from the Alps is swelling river levels in the Netherlands, storms and droughts are more frequent, and rising seas are increasing salination, he explained.
His biggest fear would be a breach of a levee protecting the Netherlands -- "the impact would be immense", but he is confident in Dutch preparations.
"I always sleep very well... we are really good protectors... the probability is really very, very low, so that's why it's not keeping me awake," said Vonk.
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