A man plummeted to his death Thursday after falling down a hole at a Brooklyn construction site.

The man was found in the afternoon in the basement of a building located at 350 Henry Street in Cobble Hill.

Police say he fell 20 feet down some sort of shaft.

Investigators say the man was not a construction worker nor an employee at nearby Long Island College Hospital which is adjacent to the site where he was found.

Police have not yet released his identity.