Their project is called Deep (not The Deep) and the site was chosen after a global search for the perfect location to build and test underwater accommodation, which the project founders say will enable them to establish a “permanent human presence” under the sea from 2027. The 20-hectare (50-acre) site in Gloucestershire was once a limestone quarry that was flooded in the 1990s and used by a dive school until 2022. Now, it is being transformed into a state-of-the-art facility that will feature accommodation units, a training school and a platform for mini submersibles to take people down to living...