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A Knightsbridge house could be tripled in size by drilling that goes 50 feet underground.
But the neighbours of the homeowner who wants to do this has aren't too happy, as Marcus Powell reports.
It is thought there will also be a large wine cellar, an art storage room, gym facilities and male and female changing rooms at the house owned by David Graham, a Canadian who according to reports made hundreds of millions of pounds when he sold his cable television business.
The excavation will descend over 50 feet below the surface say reports, deeper than the height of nearby houses, and will feature a 45-foot swimming pool, hot tub, sauna, massage room, ballroom, covered courtyards, staff accommodation, parking, a turning circle and car lift.
Plans for a huge three-storey basement extension that will treble the size of a Knightsbridge house owned by David Graham have sparked an angry campaign from neighbours, including novelist Edna O'Brien. So what is he planning to build?
- By digging down 50 feet, a four-storey basement will triple the mansion's size
- There'll be a car lift
- And a 45-foot swimming pool which comes with a hot tub.
- There'll be accommodation for staff
- And what subterranean residential complex would be complete without its own ballroom?