When I saw a historical history site in Aceh, a power station ship that was swept away by a Tsunami waves of Aceh, my eyes were fixed on a rusted iron object, this thing is called Anchors.
Of course you know the object called an anchor, because the anchor is a device that serves as a hook for the ship so as not to be carried by the current or wind.
The anchors are made very heavy because the chains and anchors are made of iron. When a ship stops somewhere, the anchor will be released until it touches of ground under the ship.
Which removable anchors will sink into the ground to inhibit the movement of boats carried by currents or strong winds.
In the case which of happened in 2004 when the Tsunami struck Aceh, a power station ship be strandid as far as 2.4 km, I wondered how a ship with a large weight and an anchor that stuck into the ground could not resist enormous flow water..? that flowed with it fast, Only God knows..!
@zamri