Assertion: glider's buoyancy | /r/HasProperty | adjusted
Facets:
value: by using a piston
type: MANNER
Source sentences:
text: Buoyancy is adjusted either by using a piston to flood/evacuate a compartment with seawater (Slocum) or by moving oil in/out of an external bladder (SeaExplorer, Seaglider, Spray, and Slocum Thermal).