Big sand bags (around 1.5 - 2 metres high I think per bag), giant sand bags. Of a good material.
And building a base or atleast the fortifications, through the filling of the bags.
The bags will take up low amounts of space and they are light.
And then filling them on the spot with sand.
It's also possible to stack the bags.
I had seen this recently.
Update: Mainly they also put metal around it. Metal construction mesh, mainly.
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