köken: Formally un- (“un-”) + Tiefe (“depth”). The nautical sense “shallows” is chiefly from Middle Low German undēpe (compare Dutch ondiepte (“shallows”)). It is also attested in Old High German untiufī, but seemingly not in Middle High German. In the sense “abyss”, the prefix un- takes the meaning “inconceivable” as, for example, in Unding (“absurdity, deformity”). It is first attested in Middle High…
Eine Untiefe mit 6 m Wasser soll rw. 121° (mw. SOzO¹/₄O) von der Insel liegen, doch ist ihre Entfernung von der Insel nicht bekannt.