The building site had been created by filling in the Collect Pond that was the principal water source for Colonial New York City. Industrialization and population density by the late 18th century resulted in the severe pollution of the Collect, so it was condemned, drained, and filled in by 1817. The landfill job was poorly done, however, and the ground began to subside in less than 10 years. The resulting swampy, foul-smelling conditions transformed the neighborhood into a slum known as Five Points by the time that prison construction started in 1838. The heavy masonry of Haviland's design was built atop vertical piles of lashed hemlock tree trunks in a bid for stability, but the entire structure began to sink soon after it was opened. This damp foundation was primarily responsible for its unsanitary conditions in the decades that followed. Charles Dickens wrote about the jail in "American Notes": "Such indecent and disgusting dungeons as these cells, would bring disgrace upon the most despotic empire in the world!"