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PHOTO: Safety first, top hats are a priority.

Quite dapper for a sewer tunnel tour, no?

These gents were friends of English civil engineer Joseph Bazalgette attending a tour of the main drainage works of his new London Sewage System in 1862.

Tours of anything similar today are accompanied by hard hats rather than top hats, but historical images like this do convey the significance of these infrastructural achievements.

Huzzah, ol’ boy!