Fathom was upset and rose to the surface. A "shot", one of the forged lengths of chain joined by shackles to form an anchor cable, was usually 15 fathoms long (). A "shackle", a length of cable or chain equal to 12.5 fathoms or 75 feet. In 1949, the British navy redefined the shackle to be 15 fathoms. In Finland, fathom ("syli") is sometimes, albeit seldom, used as a maritime unit, of a nautical mile and of cable length. It is customary, when burying the dead, to bury the coffin at least to a depth of a fathom, or "six feet
Fathom Castle (also referred to as 'the fort in the Forest') was abandoned and the Marmion family relocated to nearby fortified Carlingford (strongly defended by troops of King John's Castle.) The Marmions were prominent in the governance of Carlingford until 1655 when they were dispossessed for rebellion, losing their large holdings including a castle which was possibly the structure now referred to as 'The Mint'. Archaeological & Historical Society, 2000 Fathom Castle Fathom Castle, also known as Feedom Castle, was a castle in Fathom (sometimes 'Fidun') County Armagh near Newry, County Down, Northern Ireland. A stronghold of the O'Neill's, the castle was