submersible
n. countable B2 Upper Intermediate US //səbˈmɝsɪbəɫ// UK //səbmˈɜːsəbəl// sub·mersible
n. a small boat or vehicle that can travel underwater. It is usually used for research or to explore the deep ocean.
n. a small, self-propelled vehicle capable of operating underwater. Often used for deep-sea exploration or scientific research.
The scientists used a submersible to study the ocean floor.
The research team spent three days inside the submersible, collecting samples from the deep-sea vents.
While large submarines are designed for military or long-range transport, a submersible is typically a smaller, more maneuverable craft intended for specialized underwater observation and data collection.
From submerse + -ible.