here is NC law:
Salvage of Abandoned Shipwrecks and Other Underwater Archeological Sites
North Carolina
General Statutes Chapter 121, Article 3
North Carolina's underwater archaeology program was instituted in 1967 as a result of this law. Subsection 121-22 establishes title for the State to all shipwrecks, vessels, cargoes, tackle and underwater archaeological artifacts abandoned for more than ten (10) years and lying on the bottoms of navigable waters and ocean waters from within one marine league seaward from the Atlantic seashore extreme low watermark.
The Division of Archives and History is the custodian of all shipwrecks and other underwater archaeological resources and is charged with promulgating necessary rules and regulations for the protection of those resources. The Underwater Archaeology Unit (UAU), Office of State Archaeology, State Historic Preservation Office, is the professional staff responsible for conducting or supervising the survey, protection, preservation and systematic recovery of underwater archaeological resources. The UAU also coordinates and monitors progress and results of permits issued by the Department of Cultural Resources.
Permits are required for the exploration, recovery or salvage of state-owned abandoned shipwrecks and underwater archaeological artifacts. Permits may be issued on the following basis:
? the applicant has adequate funds, equipment, and facilities to undertake and complete the operation, is capable of providing supervision of all phases of the operation and has demonstrated the ability to carry out acceptable exploration, recovery or salvage projects;
? the proposed activity is undertaken for the purpose of furthering archaeological knowledge in the public interest;
? the proposed activity employs accepted techniques of survey, excavation, recovery, recording, preservation, and analysis used in exploration, recovery and salvage projects; and
? the underwater archaeological artifacts recovered during the proposed project will be properly conserved and these artifacts and copies of associated archaeological records and data will be curated in an acceptable manner.
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"Webster:
? League, from Webster's 1913: "A measure of length or distance, varying in different countries from about 2.4 to 4.6 English statute miles of 5280 feet each, and used (as a land measure) chiefly on the continent of Europe, and in the Spanish parts of America. The marine league of England and the United States is equal to three marine, or geographical, miles of 6080 feet each. Note: The English land league is equal to three English statute miles. The Spanish and French leagues vary in each country according to usage and the kind of measurement to which they are applied. The Dutch and German leagues contain about four geographical miles, or about 4.6 English statute miles."