The complex, named Deepspot, includes a diving pool with artificial underwater caves and Mayan ruins—and even a small wreck for scuba and free divers to explore.
Unlike regular swimming pools, Deepspot can open despite coronavirus restrictions in Poland because it qualifies as a training centre because it offers courses.
Deepspot is located in Mszczonow, a town in central Poland, about 40 kilometers away from the Polish capital Warsaw. Construction began in mid-2018.
"There is no beautiful fish or coral reefs here, so it is not a substitute for the sea, but it is really a good place to learn and train in order to dive safely," Przemyslaw Kacprzak, a 39-year-old scuba instructor who was among those attending the swimming pool's opening, told EuroNews.
Construction took two years and cost 40 million zlotys (€8.9 million). Currently, it is the deepest such pool, surpassing Montegrotto Terme in Italy which is 42 metres deep. The Blue Abyss pool planned to open in Britain in 2021, will be 50 m / 164ft deep.