Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Furnishings and Equipment (hierarchy name)
4. Transportation Vehicles (hierarchy name)
5. vehicles (transportation)
6. watercraft
7. [watercraft by specific type]
8. [watercraft by operating environment]
9. [watercraft by displacement]
10. subsurface watercraft
11. submersibles

Narrower term/s

• autonomous underwater vehicles
• remotely operated vehicles

Anotations

Scope note:

Underwater vehicles that maneuver without humans on board. These exist in two types: remotely operated underwater vehicles (ROVs), which are tethered to and controlled by a remote operator, and autonomous underwater vehicles (AUVs), which maneuver independently of direct operator input.