Fathoms Below Engr Dr Naila Hina The sea of deception and other heartfelt beautiful as well as meloncholic poetry. Fathoms below" is a phrase that refers to a depth of water measured in fathoms: Fathom: A unit of measurement used to measure the depth of water or the length of a nautical rope or cable. One fathom is equal to six feet (1.83 meters). Fathoms below: A phrase that refers to a depth of water measured in fathoms.