Last time I posted about Neeltje Jans, I wrote that it is a necessary part of the Zeeland province. For some reason, I didn’t write why… But I’ll write a bit more about it here.
Large parts of the Netherlands lie beneath sea levels, which means that whenever the sea rises more than the normal tide, it could be a huge problem. Earlier they had built dikes to keep the water out, but this had its pros and cons. In 1953 there was a huge flood coming in from the North Sea that ruined some of the dikes that were already in poor condition. After this, they worked hard to get a better system in place. The Delta works is a system that can shut water out, as well as letting some or all of it into the dams.
You can read about the Delta works here on the website of the museum on Neeltje Jans, or look up the North Sea flood of 1953, and how they worked to ensure a better chance of it not happening again. I recommend the Dutch movie De storm, a fictional story set in the historical context of the North Sea flood.