"Due to the timing of the collapse, the spill went unnoticed to many responsible state and federal environmental regulatory agencies. U.S. Environmental Protection Agency officials were not aware of the collapse until contacted by the Windsor Star on Wednesday."

And people think the Line 5 tunnel is a good idea...

https://www.freep.com/story/news/local/michigan/detroit/2019/12/05/detroit-bulk-storage-revere-copper-detroit-river-uranium/2618868001/