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Sewage treatment plant officials in Michigan are trying to figure out what happened to 15 million gallons of partially-treated sewage, which used to be stored in lagoon near the village of Sand Lake – and now isn’t.

15 million gallons of partially treated sewage water disappeared from a 250,000 square-foot storage lagoon into an underground sinkhole, but officials don’t know where it went after that.

Kent County utility operator Nathan Danenberg, who runs the sewage treatment system for Sand Lake, discovered the leak in the 8-foot-deep lagoon on Friday while taking samples. It wasn’t clear when or why the leak occurred.

This is of some concern to locals, as their water supply is taken from wells that are downstream of the now mysteriously vanished sewage.

‘We don’t smell anything, and we don’t see anything,’ said Nathan Danenberg, the man in charge of sewage treatment for the village, told The Grand Rapids Press. “I don’t know if maybe there are old mines in the area … It’s an odd case. A sinkhole gobbled up all the water and we don’t know where it went… It seems to have just gone down into the earth.”

The lagoon, lined with clay, is one of three that house sewage from the village during winter while it is treated with bacteria.