Shoppers certainly weren't expecting to see this.

A potential underground meth lab was discovered in the parking lot of a Walmart in Amherst, New York Monday afternoon.

Police were never even tipped off. WRIC reports they discovered evidence of the underground lab while on routine patrol.

Amherst Police said they discovered the evidence in a culvert that runs below the parking lot of the Walmart. They said it was not secured and that anyone could access it.

Two first responders from the NYSP Contaminated Crime Scene Emergency Response Team dressed in hazmat suits were lowered beneath the parking lot to investigate and gather evidence.

Luckily, police say there was no threat of air contamination or flammability.

No arrests have been made yet.