1. existing, occurring, or designed for use underwater

Examples

• The marine biologist studied subaquatic plant life in the coral reef.
• Subaquatic photography requires specialized waterproof equipment.
• The subaquatic cave system extended for miles beneath the ocean floor.
• Divers explored the subaquatic ruins of the ancient city.
• The submarine’s subaquatic mission lasted three weeks.
• Scientists discovered new subaquatic species in the deep ocean trench.