Keel block
In marine terms, a keel block, is a concrete or dense wood cuboid that rests under a ship during a time of repair, construction, or in the event of a dock being drained. The block rests under the keel of a ship.{{Cite web |title=Keel Blocks |url=https://www.wartsila.com/encyclopedia/term/keel-blocks#:~:text=marine,rests%20during%20construction%20or%20repair |website=Wartsila.com (n.d)}}
Purpose
The purpose of a keel block is to prevent the ship from sitting directly on the ground and to prevent damage or instability that sitting on the ground may cause.{{Cite web |title=Keel Blocks |url=https://www.oxfordreference.com/view/10.1093/oi/authority.20110803100032133#:~:text=The%20line%20of%20blocks%20on,the%20dock%20is%20pumped%20dry |access-date=10 October 2023 |website=Oxford Reference}}