#sinking  a descent as through liquid (especially through water); "they still talk about the sinking of the Titanic"
  supertype:  descent.change_of_location  a movement downward
  subtype:  settling__subsiding__subsidence  a gradual sinking to a lower level
  subtype:  submergence__submerging__submersion__immersion  covering completely with water
     subtype:  dip.submergence  a brief immersion
  subtype:  foundering__going_under__goingunder  (of a ship) sinking

No statement uses or specializes sinking; click here to add one.