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Flotsam, jetsam, lagan, and derelict

In maritime law, flotsam, jetsam, lagan, and derelict are specific kinds of shipwreck. The words have specific nautical meanings, with legal consequences in the law of admiralty and marine salvage. A shipwreck is defined as the remains of a ship that has been wrecked, a destroyed ship at sea, whether it be sunken or floating on the surface of the water.

Overview
A wreck is categorized as property belonging to no apparent owner, that either sinks to the seabed, or floats on the surface of the water, whether it be intentionally cast overboard, or as the result of an accident. The term encompasses the hull of the vessel and its fixtures, as well as any other form of object onboard, such as cargo and stores, and personal effects of the crew and passengers. This also encompasses the narrower definition of salvage, that is, property that has been recovered from a wreckage, or the recovery of the ship itself. There are a number of factors that contribute to the formation of a shipwreck, that can be divided into physical and cultural processes. A site can be affected by physical processes, that is, naturally occurring processes, such as the corrosion caused by salinity and ocean currents, or the growth of native and foreign marine organisms. It can also be affected by cultural processes, that is, by human interactions, such as adding or removing materials from the site of the wreck. Any archaeological activity, such as excavation, may also be considered invasive and tampering.

In terms of maritime law, different meanings are attributed to the terms, based on what the jurisdiction is, as well as the context. For example, a distinction is made between goods that wash ashore, from those that are for some reason not salvageable and/or lost at sea.

Law of Salvage
Ownership of a wreck is a highly controversial issue, as there are no clear lines within which it is defined. It may be acquired through various means that range from succession to confiscation. There is also a distinction to be made between the ownership of the hull itself and the cargo it contains, as the hull may be abandoned intentionally, whereas the cargo may be out of necessity (in the case of an emergency or the need to shed weight from the vessel). In these parameters, abandonment of the ship by its passengers constitutes as a loss of possession, but to abandon the claim on the title itself, intention to relinquish it is required. This affects wrecks by limiting that which is considered “abandoned”. Generally, a ship is defined as “abandoned” if there is no hope of recovery, known legally as Sine spe recuperandi (which is the Latin phrase for "no hope of recovery"), and this fact must be clearly proven by the salvaging party. It must also occur on navigable waters. The term “salvage” is used to indicate a salvage operation, as well as the subsequent awarded compensation. It is considered a voluntary service rendered in cases such as danger to the wreck, or the surrounding navigable waters. In terms of compensation, it is seen as being awarded to anyone who voluntarily assisted in the recuperation of the wreck, whether it be saved from upcoming danger, or from loss.

The Law of Salvage finds its origins in the Roman practice of negotiorum gestio, which dictated that one who preserved or improved upon the property of another, was owed compensation from the owner, even if the service was not requested by the latter. The law did not apply to maritime regulations, but were the basis for following ordinances, such as the Marine Ordinance of Trani, which stated that a “finder” was to be rewarded, whether the owner claimed the goods or not. The laws have evolved since negotiorum gestio, and today, in the United States, a salvor who voluntarily brings the goods back into port may legally lay claim to them, or deliver them to a marshal, in return for a reward.

Flotsam
Also known as “flotsan”, the term “flotsam” refers to a sunken vessel whose goods float to the surface of the sea, or any floating cargo that is cast overboard.

In terms of maritime law, the definition of flotsam pertains to goods that are floating on the surface of the water as the result of a wreck or an accident. As there is no clear way of defining ownership, one who discovers a flotsam is allowed to claim it, unless someone claims ownership to the items in question.

Jetsam
The term “jetsam” designates any cargo that floats to the surface of the sea from a wreckage. Generally, “jettisoning” connotates the action of throwing goods overboard to lighten the load of the ship if it is in danger of being sunk.

Per maritime law, one who discovers these artifacts is required to return them to their rightful owner only in the case that the latter makes a legally abiding claim.

Lagan
Also called “Ligan”, the term refers to goods that are cast overboard and are heavy enough to sink to the ocean floor, but are tied or otherwise linked to a floating marker, such as a buoy or cork, so that they can be found again by whomever marked the item. Lagan can also refer to large objects that are trapped within the sinking vessel.

According to maritime law, a buoy, or otherwise floating object, constitutes as sufficient grounds in laying claim to an artifact. In other words, when faced with a lagan, one is required to return the artifact to its rightful owner.

Derelict
“Derelict” can refer to goods that have sunk to the ocean floor, relinquished willingly or forcefully by its owner, and thus abandoned, but which no one has any hope of reclaiming.

In terms of maritime law, derelict is considered property abandoned on navigable waters which has no hope of being recovered, or sine spe recuperandi, and no expectation of it being returned to its owner, or sine animo revertendi.