Death Defying Swimming Pool Boasts 360 Degree Views of London
compass-pools.co.uk
compass-pools.co.uk
The whole thing also seems like very much an exercise in "because we can" and excess as opposed to a remotely practical swimming pool.
ADDED: I'm actually a bit surprised this would meet fire, etc. code. Presumably you couldn't have a level of the building that could be only accessed by elevator. Not sure why this would be different.
In any case, this is more about having a show-off design than something people will use other than as a one-off to say that they did it.