Assertion: diver | /r/NotCapableOf | keep his or her head
Facets:
Source sentences:
text: Back inflation BCs are less bulky at the sides but may have a tendency to float the diver tilted forward on the surface depending on weight and buoyancy distribution,[citation needed] which presents a possible hazard in an emergency if the diver is unconscious or otherwise unable to keep his or her head above the water.