Marine archaeologists using deep-sea autonomous vehicles have discovered the remains of a unique Roman industrial atol off the coast of Croatia, dating back to the late 1st century CE. This site appears to have functioned as a specialized offshore glass-blowing center, likely to keep the fire-prone industry away from urban centers while utilizing coastal sand and salt resources.
The excavation revealed dozens of submerged stone kilns and, remarkably, hundreds of dichroic glass fragments that change color based on the light angle. These "rainbow glass" samples suggest a level of metallurgical sophistication previously thought to be exclusive to imperial workshops in Rome. The site is uniquely preserved due to a sudden seismic event that dropped the structure ten meters below current sea levels.