The world first 360-degree infinity pool is coming to London. The 600,000-litre pool that will be built on the top a 55-story hotel by Compass Pools. Speaking on accessing this pool the technical director and pool designer Alex Kemsley said “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 litres of water draining through the building either, The compromise was a rotating spiral staircase based on a submarine will rise from the pool floor when a swimmer wants to get in or get out.”