Hand-coloured print of the operation of diving bell used to assess damage to the Thames Tunnel following flooding in the late 1820s, taken from Edward Walford, Old and New London: A Narrative of its History, its People, and its Places (London: Cassell and Company Limited, 1893).
For a contemporary view of the operation of the diving bell, drawn by Isambard Kingdom Brunel, see LDBRU:2017.1.