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

Additional parents:

1. top of the aat hierarchies
2. Objects Facet
3. Furnishings and Equipment
4. Transportation Vehicles
5. vehicles
6. watercraft
7. watercraft by specific type
8. watercraft by function
9. naval ships
10. warships
11. warships carrying projectile weapons
12. subsurface combatants

Anotations

Scope note:

Vessels capable of continuous, extended underwater voyages under their own power without surfacing; often naval combatant vessels. For vessels capable of complete submersion for only limited amounts of time and which may or may not move under their own power, use "submersibles."