'World's deepest' swimming pool opens in Poland
https://edition.cnn.com/travel/article/worlds-deepest-diving-pool-opens/index.html
I think that administrator of the swimming pool should pay attention to safety inside the pool. If diver has a trouble in wrecked ship, it will be difficult to be noticed by other people, because the diver cannot be seen from above water level, if he/she is in the wrecked ship.
