Loading and unloading ships requires knowledge of the operation of loading equipment, the proper techniques for lifting and stowing
cargo, and the correct handling of
hazardous materials. In addition, workers must be physically strong and able to follow orders attentively. Many longshoremen are needed to unload a ship. A ship can only be at a port for a limited amount of time, so their work must be completed quickly. In earlier days before the introduction of
containerization, men who loaded and unloaded ships had to tie down cargoes with rope. A type of
stopper knot is called the
stevedore knot. Securely tying up parcels of goods is called
stevedore lashing or
stevedore knotting. While loading a
general cargo vessel, they use
dunnage, which are pieces of wood (or nowadays sometimes strong inflatable
dunnage bags) set down to keep the cargo out of any water that might be lying in the hold or are placed as
shims between cargo crates for
load securing. Today, the vast majority of non-
bulk cargo is transported in
intermodal containers. The containers arrive at a port by truck, rail, or another ship and are stacked in the port's storage area. When the vessel that will be transporting them arrives, the containers it is offloading are unloaded by a crane. The containers either leave the port by truck or rail or are stored until they are placed on another ship. Once the ship is offloaded, the containers it leaves with are brought to the dock by truck. A crane lifts the containers from the trucks onto the ship. As the containers pile up on the ship, the workers connect them to the vessel and the other already-placed containers. The jobs involved include the crane operators, the workers who connect the containers to the ship and each other, the truck drivers who transport the containers from the dock and storage area, the workers who track the containers in the storage area as they are loaded and unloaded, as well as various supervisors. Those workers at the port who handle and move the containers are likely to be considered stevedores or dockworkers. Before containerization, freight was often handled with a
longshoreman’s hook, a tool which became emblematic of the profession (mainly on the west coast of the United States and Canada). Traditionally, stevedores had no fixed job but would arrive at the docks in the morning seeking employment for the day.
London dockers called this practice
standing on the stones, while in the United States, it was referred to as
shaping up or assembling for the
shape-up. Dock workers have been a prominent part of the modern
labor movement. File:Hong Kong 2005 auf Reede, zwei Bargen mit Kränen an Backbord fest.jpg|At anchor, two
barges with cranes (floating derricks) at port File:Ein Container wird von Deck gehievt.jpg|A container is lifted from the deck. File:Hafenarbeiter bei ihrer gefährlichen Arbeit auf den Containern in der Luke.jpg|Dockworkers on the containers in the ship's hatch File:Starker Gezeitenstrom, Ladungsarbeiten bei schwierigen Arbeitsbedingungen.jpg|Strong tidal current, loading work in adverse conditions ==Notable dockworkers==