Answer: sinktothebottom

AnswerCrossword Clue
SINKTOTHEBOTTOM

Descend as far as possible, as a shipwreck

SINKTOTHEBOTTOM

Fail to be buoyant

SINKTOTHEBOTTOM

Hit a new low?

SINKTOTHEBOTTOM
Flunk a buoyancy test
SINKTOTHEBOTTOM
Reach the lowest point
SINKTOTHEBOTTOMProve not to be buoyant
SINKTOTHEBOTTOMMake a new low