Court Ruling on Spanish Frigates Foils Modern-Day Treasure Hunt
Federal appeals court in Virginia has ruled in favor of Spain, granting it ownership of two warships lost off state's coastline more than two centuries ago; ruling snatches ships away from Ben Benson, treasure hunter who estimated shipwrecks bore more than half-billion dollars in lost coins and precious metals; experts say shift in Spain's stance could end glory days of treasure hunting and beginning of time when Spain oversees recovery of its lost fleets in pursuit of cultural riches, historical insights and new respect for Spanish graves; Spain says victory marks start of aggressive effort to look after its old interests and, probably, team up for recovery work with coastal nations whose waters hold its sunken ships; Benson scores decision; may file appeal; photos; maps (M)
