An Oklahoma man searching for a $20 bill he accidentally dropped ended up stuck in an underground water drainage system for two days.

The man, who was not identified, was found alive after a group of high school students heard a noise coming from a manhole and called 911.

"We see a gentleman down in the bottom of it and it seemed that he had been down there a couple of days," Lawton, Okla., Police Sergeant John Chelenza told ABC affiliate KSWO of what he discovered after opening the manhole.

"That's the first time in going on 28 years that we have found somebody down in a storm drain," Chelenza said.

The man was 12 to 15 feet below ground when he was discovered, requiring a ladder to get him out. He was dehydrated and disoriented, unable to tell police initially how long he had been there and how he had gotten in.

"He had a bump on his head," Chelenza told KSWO. "He may have hit his head against a wall down there because it obviously pretty dark unless he is next to a storm drain where light could get into."

Police told KSWO the man, who never found the $20 he was searching for, likely had to crawl his way into the 42-inch diameter pipe in which he was found.

Calls placed to the Lawton Police Department on the man's current condition were not immediately returned.