In the 1960s, Germany tackled its Nuclear Waste problem by burying their intermediate and low-level waste in salt mines at Morselbad and Asse.
There are several things you can take from the video.
First, they did very little geological research, before deciding to use this mine, and one at Morsellbad, to store Nuclear Waste. At the time rock salt was thought to be the best rock for storing Nuclear material. It made a good barrier to radiation, and it is dry.
Second, there was no water in the mine until there was. For twenty years it was dry but then water started to seep in. What this tells us is that we can sink boreholes and find no groundwater today but that is no guarantee that it won't be there in twenty years
Third, Rocks move, meaning that not only did water suddenly appear but it also means that it continues to get worse.
NWS has told us that it couldn't happen here because they have done their research. However, hundreds of years of mining should have told us that when working deep underground, nothing can be taken for granted.
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