https://www.mercurynews.com/2021/04/26/look-up-in-the-sky-its-a-person-doing-the-backstroke/

For some, flailing around in a clear box suspended 115 feet above the streets of London is the stuff of nightmares. For others, it’s the ultimate status symbol.

The Sky Pool is a 82-foot transparent swimming pool stretched between the 10th stories of two residential skyscrapers in southwest London’s Nine Elms neighborhood — and it’s only open to the apartment complex’s lucky residents.