subaquatic

/ˌsʌbəˈkwɑtɪk/
adjective
  1. Existing, occurring, or used under water.
    • The divers explored a subaquatic cave system off the coast.
    • Subaquatic welding is a specialized skill used in repairing ships.
    • Subaquatic plants like seaweed provide oxygen for fish.
Antonyms
What does "subaquatic" mean? | whatsthatwordmean | whatsthatwordmean