IPA: //ˈhaɪdrəʊspeɪs//
KK: /haɪdroʊspeɪs/
The areas located below the surface of the ocean.
Scientists are studying the hydrospace to learn more about underwater ecosystems.
Hydrospace is formed from "hydro-" (from Greek "hydor", meaning water) and "space" (from Latin "spatium", meaning area or expanse). The word refers to a space or area related to water.
Think of 'water' ('hydro-') and 'area' ('space') to remember that hydrospace refers to an area related to water.