They need to freeze the ground to avoid water flowing into and out of the area. Covering in concrete alone wouldn’t safely contain it, they would need to add co

They need to freeze the ground to avoid water flowing into and out of the area. Covering in concrete alone wouldn’t safely contain it, they would need to add concrete beneath the fuel, which while physically possible would be unbelievably expensive and not actually last that long. Eventually tossing future generations an even more expensive problem. https://www.tepco.co.jp/en/decommision/planaction/landwardwall/index-e.html#:~:text=It%20is%20actually%20a%20frozen,its%20mixing%20with%20contaminated%20water https://www.tepco.co.jp/en/decommision/planaction/landwardwa....