Anchor
An anchor is a device, normally made of metal, used to connect a vessel to the bed of a body of water to prevent the craft from drifting due to wind or current. The word derives from Latin "ancora", which itself comes from the Greek ἄγκυρα ("ankura").
Offshore embedded anchors
The increased cost of installing anchors in deep water has led to the inception of dynamically penetrating anchors that embed themselves into the seabed under free-fall. These anchors typically comprise of a thick-walled, steel, tubular shaft filled with scrap metal or concrete and fitted with a conical tip. Steel plates (flukes) are often attached to the shaft to improve its hydrodynamic stability and to provide additional frictional resistance against uplift.