The reality has turned out to be very different, and the ship has increasingly deteriorated since she sank in April 1912. Her gradual decay is due to a number of different processes – physical, chemical and biological.[102] She is situated on an undulating, gently sloping area of seabed in Titanic Canyon, which is swept by the Western Boundary Current. Eddies from the current flow constantly across the wreck, scouring the sea bed and keeping sediment from building up over the hull.[85] The current is strong and often changeable, gradually opening up holes in the ship's hull.[103] Salt corrosion eats away at the hull,[102] and it is also affected by galvanic corrosion.[103]