Akra, a recently discovered site near the Black Sea, is being billed as the Bulgarian Herculaneum. Different time period, different culture, and different demise, but I think the link to Herculaneum is intended to imply that it is another well-preserved site that was part of the Byzantine empire & abandoned in haste during battle. Part of the site (fortress) lies underwater, with the remainder of the site currently on land. It sounds like an awesome excavation:
Dimitrov told 24 Chassa that the finds included several fully preserved vessels, clay amphorae, lamps, gorgeous tiny glass cups, along with a number of ceramic fragments, which will be restored. The items were made at the time by craftsmen in northern Africa and then taken to Akin by ships.