In pictures: Inside the world's deepest swimming pool

Hotel Terme Millepini, a 100-room four-star hotel in Padua, Italy, is recognized for having the world's deepest swimming pool, the Y-40, which put it in the Guinness World Records

Hotel Terme Millepini, a 100-room four-star hotel in Padua, Italy, is recognized for having the world's deepest swimming pool, the Y-40, which put it in the Guinness World Records. 

Students swim during an apnea course by Italian free diver, Umberto Pelizzari, at the "Y-40 The Deep Joy" swimming pool on December 8, 2014. All pics/AFP

The swimming pool is built over thermal sources bringing after cooling down a water at 32-34 degrees Celsius.

Y-40, with its depth of 42mt, is officially awarded the "Deepest Swimming Pool for Diving" by the Guinness World Records.

Designed by architect Emanuele Boaretto, Y-40 "The Deep Joy" pool first opened on 5 June 2014. It's 40 metres (131 ft) deep, making it the deepest pool in the world and contains 4,300 cubic metres (1,136,000 US gal) of thermal water kept at a temperature of 32–34 °C (90–93 °F).

Underwater caves, a suspended, transparent, underwater tunnel for guests to walk through are some of the striking features of the pool.

Plaforms ranging from 1.3 metres (4.3 ft) to 12 metres (39 ft), before the walls of the pool narrow into a well-like funnel which plunges straight down to 40 metres (131 ft). Visitors can also indulge in freediving or scuba diving after buying tickets from the hotel.

Before this, the Nemo 33 pool in Belgium held the Guinness World Record for being the 'world's deepest pool'. Italian freediver Umberto Pelizzari first measured the depth before the pool was open to the general public.

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