"Normally a simple ladder would suffice, but we didn't want stairs on the outside of the building or in the pool as it would spoil the view - and obviously you don't want 600,000 liters of water draining through the building either, " said Compass Pool's technical director and pool designer Alex Kemsley.
The glass-bottom pool is also created to allow visitors to the building to see swimmers above, while giving swimmers the illusion of being suspended in the sky. According to the design team, a rotating spiral staircase, much like a submarine's door, will arise from the floor of the pool. And what will it take to get all that water up there?
If you're wondering how it would feel like to have the entire roof of your next hotel building to be a swimming pool, then your dream might be coming to be true very soon and that would happen in the UK.
While the pool walls and the floor is made of cast acrylic instead of traditional glass, which would help keep the water looking clear because the material transmits light at a similar wavelength to water.More news: WWE's John Cena Joins 'Fast & Furious 9'
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The plan has eco-friendly features as well - the heating system will use waste energy from the hotel's air conditioning system.
The pool, designed by Compass Pools, would grace the top of the skyscraper, 200 meters high in the sky - though where exactly the building will be is still to be decided.
The designers envisage that the pool will sparkle like "jewel-topped torch" at night, with the building fitted with a collection of lights.
Infinity pools are visual and architectural masterpieces. That's 220m above London's streets - enough to turn one pool-passionate member of Team Londonist rather pale at the thought. "The second to deliver the staircase up to water level", Kemsley told.
The location of the pool is yet to be confirmed, but Compass say construction work could begin as early as 2020. "But on this project, we actually started with the pool design and essentially said, 'how do we put a building underneath this?'"