15 C.F.R. § 922.221
The following terms are defined for purposes of this subpart U:
Sanctuary resource means all historical resources as defined at 15 CFR 922.11 , which includes any pre-contact and historic sites, structures, districts, objects, and shipwreck sites within sanctuary boundaries.
Shipwreck site means all archaeological and material remains associated with sunken watercraft or aircraft that are historical resources, including associated components, cargo, contents, artifacts, or debris fields that may be exposed or buried within the lake bed.
Tethered underwater mobile system means remotely operated vehicles and other systems with onboard propulsion systems that utilize a tether connected to a station-holding (e.g. by anchor, dynamic positioning, or manual vessel operation) surface support vessel.
15 C.F.R. §922.221