f you can hold your breath all the way to the bottom here, you are in a very small minority - this is Y-40 The Deep Joy and with a staggering depth of -40 metres it is the world's deepest pool.
The incredible swim centre, designed by renowned architect Emanuele Boaretto, is located within the four-star Hotel Terme Millepini in Montegrotto Terme, Italy.
Operating since June, the pool has a diving height of a 12-storey building, or nine double decker buses placed on top of each other.
Wet suits aren't required here as swimmers can enjoy a regular temperature of between 32-34°C.
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Record breaker: Y-40 The Deep Joy is the world's deepest pool with a staggering depth of -40 metres
There are several platforms, ranging from -1.3m, to -12m. The pool at the surface is 21m by 18m but it becomes a narrow well-like hole as the depths plummet straight down.
Visitors are able to use the facilities for free diving and scuba diving, with underwater caves for cave diving beginners.
There is also a unique suspended underwater tunnel which is entirely transparent, so non-swimmers can experience the pool without getting wet.
There is a sunbathing deck with loungers on the roof, where swimmers can recover from their deep-diving experience.
Dry dock: The underwater tunnel runs right through the middle of the pool
Plunging: One of the first divers to use the pool is filmed from the depths of the Y-40
Overtaken: The Y-40 surpassed the Nemo33 in Brussels, Belgium, which had a maximum depth of 34.5 metres
Afraid of depths? The pool features several depth platforms before narrowing into a deep descent
Activities: As well as free diving, the pool offers opportunities for scuba divers to practice cave diving
Notable figures from Italian water sports helped to launch the facility this year, including Italian free diver Umberto Pelizzari, and Enzo Maiorca, the ‘father’ of freediving in Italy.
Freediver Ilaria Molinari even donned a mermaid tail to dive down to 40 metres to wow spectators.
'Y-40 is unique in its field thanks to the spa water, which cannot be outsourced,' says architect Emanuele Boaretto.
'We want to open up new medium and long term work prospects to try and guarantee prosperity, not only for my company but also for the surrounding land and society.'
Other-worldly: Free diver Ilaria Molinari dresses as a mermaid to swim through the artificial cave-diving area
Launch: Molinari dove the depths of the pool at its opening with the help of a mermaid's tail
The pool is situated in a regional natural park of the Euganean Hills in Italy.
Mr Boaretto is planning to cover the pool with lawn to b;lend the structure into its environment.
Y-40 is open all year round and offers the equivalent of diving the height of a 12-storey building.
Activities at the pool include scuba diving, free diving, aqua fitness, watsu, hydro-kinesi therapy and special activities for pregnant women.
The four-star hotel within the region of Villa Duodo boasts 100 air-conditioned rooms.
Spectator sport: A 13-metre transparent tunnel allows non-swimmers to experience the pool
Temperate: 4,300 cubic metres of thermal water are kept at a temperature of 32-34 degrees celcius
Nemo 33 in Brussels, Belgium, was the deepest indoor swimming pool in the world before Y-40 was completed.
Its maximum depth is 34.5 metres (113 ft) and it contains 2,500,000 litres of non-chlorinated, highly filtered spring water maintained at 30C.
The pool also holds several simulated underwater caves at the 10 metres depth level.
Due to the warm temperature in the pool, divers can dive for extended periods without a wet suit.
It was designed by a Belgian diving expert, John Beernaerts, and is used for recreation, scuba diving practice and instruction and by film-makers and scientists.
Architectural marvel: The pool is designed by renowned architect Emanuele Boaretto
The world’s largest swimming pool, completed in 2006, is located at the San Alfonso del Mar resort in Algarrobo, Chile.
It is estimated to have cost more than £613million to construct and covers nearly 20 acres.
Swimming a length in this would mean stroke after stroke for more than three fifths of a mile - that's 20 Olympic-size swimming pools.
The enormous man-made lagoon is set halfway up the country's Pacific coast and is filled with 66 million gallons of crystal clear seawater.
It uses a computer-controlled suction and filtration system to suck water in from the ocean at one end and pump it out at the other, while the sun warms it to 26C - nine degrees higher than the sea.
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