It's been under water for almost two centuries, but today visitors to one of north London's locks got a rare chance - to take a tour inside.
Camden Lock has been drained for restoration work, exposing the structure of the chamber.
It'll cost 130 thousand pounds to replace both sets of gates and repair the timber work.
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An exclusive poll of the capital's residents for ITV London has found Labour would make sweeping gains if an election were held tomorrow.