I had a conversation years ago with a nuclear engineer, a coworker at the facility which we both worked. I told him about my idea and he said that the casks (developed by Bechtel Engineering way back in the 1970s) would safely store the waste as it was first buried by tons of sediment, then all of it would eventually be crushed molecule thin as it slid under the tectonic plate.
Keep in mind that the Aleutian Trench is thousands of feet deep and the casks would be under megatons of seawater.
This recycling happens slowly over a very long period time. The main idea is to keep it far from human contact.
I’m sure that some at this post will be saddened to know it is highly unlikely that radioactive worms or monsters will be issuing from the trench. Sorry!
But wasn’t that how Gozilla was created? Japan is also a volcanic arc system. (serious question here)
Tons of sediment from undersea landslides?