We must endeavour to realize a succession of gradualsinkings or depressions into deep water, alternating with gradual emergings into shallows, and eventually a gradual continued lifting of the whole district[…]
2022 August 10, “Network News: New maintenance tunnel at Euston”, inRAIL, number963, page21:
The excavation took 16 months of 24-hour working to complete and required thesinking of a 65ft shaft, from where workers carved out the passageway and lined it with reinforced steel and sprayed concrete.
sinking (disambiguation) on Wikipedia.Wikipedia