Submersible (noun)

A device, usually a vessel, that is designed to operate underwater.

Origin:

The term 'submersible' is derived from the prefix 'sub-' meaning 'below' and the verb 'immerse', referring to a device that can be fully immersed in water.

Examples:

1. The deep-sea submersible was used to explore the ocean floor.
2. The submersible was equipped with lights and cameras to capture images of underwater life.
3. The submersible was capable of diving to depths of over 10,000 feet.
4. She was a pilot of the submersible that explored the sunken ship.
5. The submersible was used to gather scientific data and take samples of the ocean floor.