
A Polish architect by the name of Krysztof Kotala has released designs for an audacious project with his design firm, 8+8 Concept Studio: a tennis facility located entirely underwater just off the coast of Dubai, where spectators could choose to watch the games below them, or the sea life above them through a massive glass dome.

(8+8 Concept Studio)
Why Dubai? Well, Kotala says, “[The court] should be something where there is the tradition of tennis. Dubai is perfect for this idea.”
Dubai, which is notorious for superlative construction, is already home to the world’s highest tennis court, atop the Burj al Arab skyscraper. The proposed location for Kotala’s’s project (probably one of the world’s lowest tennis courts) is just next door:
