Late in the sixties, the USA, along with Denmark who controlled Greenland at the time, thought that it’s pretty safe to bury the remnants of a military nuclear reactor within the ice sheet. They assumed continual snowfall would only bury the waste deeper.
Needless to say, the assumption was not only wrong, but the exact opposite is happening. Due to global warming, in as little as 75 years, the buried remnants will resurface and will have to be dealt with, or else. Or else they’ll enter our ocean.
Taking care of the problem isn’t really rocket science. Extract the waste, haul it some hundred kilometers north and bury it again, this time in a concrete or metal sarcophagus. It won’t be cheap but it’s probably the easiest solution. A more complicated solution would be to mail it to Washington.
Sadly, we’ve proven ourselves once again to be incapable of finding a good long-term solution for the mess we’re making through irresponsible use of technology (which is more often than not related to the military industrial complex). But humans eventually learn from past mistakes, even if sometimes the lesson needs to be repeated a hundred too many times.