Non-gravity swimming pool
From Tardis Wiki, the free Doctor Who reference
Non-gravity swimming pools were state-of-the-art, circa the 23rd century, relaxations offered by leisure planets such as Limnos 4 and Abydos. (TV: The Leisure Hive) One could dive upwards or downwards into or out of the pool. (PROSE: Doctor Who and the Leisure Hive)
