A team of divers dedicated to combing the Baltic Sea for shipwrecks said they finally have reason to celebrate after discovering a 19th-century vessel laden with about 100 sealed bottles of champagne.“ I think we have a treasure, ” Tomasz Stachura, leader of the Polish diving group Baltictech, posted to Facebook after the team’s July 11 discovery. The wreck is about 20 nautical miles south of the Swedish island of？... land. Stachura, who specializes in underwater photography, said the ship was