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 "without hope of recovery"), and this fact must be clearly proven by the salvaging party. It must also occur on navigable waters.