Anyone for underwater tennis?Updated 1308 GMT (2108 HKT) May 4, 2015 Chat with us in Facebook Messenger. Find out what's happening in the world as it unfolds. Photos: Service beneath the seaGame, set and catch of the day? Polish architect Kotala Krzysztof has come up with a unique court concept which would allow tennis matches to be contested underwater.Hide Caption 1 of 6 Photos: Service beneath the seaServing up underwater tennis does not come cheap. Krzysztof, who is reportedly seeking investors to set up the project off the coast of Dubai, estimates the court will cost between $1.7-2.5 billion to build.Hide Caption 2 of 6 Photos: Service beneath the seaIn case the tennis isn't up to scratch, the underwater court is designed to offer spectacular views of nature and could be built under the sea. The main arena is planned to seat 10,000 spectators.Hide Caption 3 of 6 Photos: Service beneath the seaDouble grand slam champion Andy Murray uses sea swimming as part of his Miami training regime but how would the world No. 3 feel about playing tennis in the deep?Hide Caption 4 of 6 Photos: Service beneath the seaTop-20 female player Sabine Lisicki is used to getting up close with marine wildlife. The German swam with dolphins ahead of the 2015 Miami Open. Hide Caption 5 of 6 Photos: Service beneath the seaRafael Nadal and Serena Williams have already dabbled in water tennis, playing on a court constructed in the middle of a swimming pool at the Hotel Gansevoort in Miami South Beach, Florida.Hide Caption 6 of 6Architect Kotala Krzysztof has designed an underwater tennis court to bring nature and sport together in a dramatic setting.TennisWTA Finals: Day by day highlightsNovak Djokovic: The $16M manTennis' tattooed teenage 'pit bull' Bouchard sues over locker-room fallSerena to miss end of season More from Sport - TennisSerena Williams' return sparks seeding debate about pregnancyJohn McEnroe is paid 10 times what Martina Navratilova gets for doing Wimbledon broadcastsRoger Federer loses to Juan Martin del Potro in Indian Wells finalRafael Nadal 'living with pain and painkillers since 2005'Roger Federer: Will Swiss star play French Open?