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

Narrower term/s

• bathyscaphes
• unmanned underwater vehicles[+]
  • autonomous underwater vehicles
  • remotely operated vehicles

Anotations

Scope note:

Vessels capable of complete submersion for a limited time; may or may not be able to move under their own power. For vessels capable of continuous, extended underwater voyages under their own power, use "submarines."