Sounds great, right? Unfortunately, in this recent paper, researchers found that some liquids were able to make it through similar layers of salt. Generally, scientists assume that oil can't make it through salt barriers in the earth--the viscous liquid can't soak through the dense salt. But in the new research scientists found that in high temperatures and pressures, like those found deep in the earth, salt can become more porous, allowing even fluids like oil (which don't dissolve salt like water) to leak through. An oil leak is bad enough, but we generally have an even stronger desire to keep nuclear waste where we put it, and if fluid can leak out of a salt barrier, it might also be able to leak in, picking up radioactive material and spreading it around.