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“One is tempted,” he wrote, “to begin searching there in spite of the huge expanse of bottom that would have to be inspected.”

In 2002, Robert D. Ballard, a discoverer of the sunken Titanic, led a Black Sea expedition that found a 2,400-year-old wreck laden with the clay storage jars of antiquity. One held remnants of a large fish that had been dried and cut into steaks, a popular food in ancient Greece.

The new team said it received exploratory permits from the Bulgarian ministries of culture and foreign affairs and limited its Black Sea hunts to parts of that nation’s exclusive economic zone, which covers thousands of square miles and runs up to roughly a mile deep.

Although the team’s official name is the Black Sea Maritime Archaeology Project, or Black Sea MAP, it also hauls up sediments to hunt for clues to how the sea’s rising waters engulfed former land surfaces and human settlements.

Team members listed on its website include the Bulgarian National Institute of Archaeology, the Bulgarian Center for Underwater Archaeology, Sodertorn University in Sweden, and the Hellenic Center for Marine Research in Greece.

Photo
An illustration of a medieval ship, based on one of the wrecks, that would have predated those sailed by Columbus to the New World.

Credit
Jon Adams/University of Southampton/Black Sea MAP

The project’s financial backer is the Expedition and Education Foundation, a charity registered in Britain whose benefactors want to remain anonymous, team members said. Dr. Adams of the University of Southampton, the team’s scientific leader, described it as catalyzing an academic-industry partnership on the largest project “of its type ever undertaken.”

Nothing is known publicly about the cost, presumably vast, of the Black Sea explorations, which are to run for three years. The endeavor began last year with a large Greek ship doing a preliminary survey. This year, the main vessel was the Stril Explorer, a British-flagged ship bearing a helicopter landing pad that usually services the undersea pipes and structures of the offshore oil industry.

Instead, archaeologists on the ship lowered its sophisticated robots to hunt for ancient shipwrecks and lost history.

In an interview, Dr. Pacheco-Ruiz of the University of Southampton said he was watching the monitors late one night in September when the undersea robot lit up a large wreck in a high state of preservation.

“I was speechless,” he recalled. “When I saw the ropes, I couldn’t believe my eyes. I still can’t.”

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Dr. Pacheco-Ruiz said the vessel hailed from the Ottoman Empire, whose capital was Constantinople (today Istanbul), and most likely went down sometime between the 17th and 19th centuries. He said the team nicknamed it “Flower of the Black Sea” because its deck bears ornate carvings, including two large posts with tops that form petals.

In an interview, Dr. Batchvarov of the University of Connecticut said most of the discoveries date to the Ottoman era. So it was that, late one night, during his shift, he assumed that a new wreck coming into view would be more of the same.

“Then I saw a quarter rudder,” he recalled, referring to a kind of large steering oar on a ship’s side. It implied the wreck was much older. Then another appeared. Quickly, he had the expedition’s leader, Dr. Adams, awakened.

“He came immediately,” Dr. Batchvarov recalled. “We looked at each other like two little boys in a candy shop.”

Dr. Batchvarov said the wreck — the medieval one found more than a half-mile down — was part of a class known by several names, including cocha and “round ship.” The latter name arose from how its ample girth let it carry more cargo and passengers than a warship.

Dr. Adams said the remarkable color images of the lost ships derived from a process known as photogrammetry. It combines photography with the careful measurement of distances between objects, letting a computer turn flat images into renderings that seem three-dimensional.

He said tethered robots shot the photographic images with video and still cameras. The distance information, he added, came from advanced sonars, which emit high-pitched sounds that echo through seawater. Their measurements, he said, can range down to less than a millimeter.

A news release from the University of Southampton refers to the images as “digital models.” Their creation, it said, “takes days even with the fastest computers.”

Filmmakers are profiling the Black Sea hunt in a documentary, according to the team’s website.

Another part of the project seeks to share the thrill of discovery with schools and educators. Students are to study on the Black Sea, the website says, or join university scientists in analyzing field samples “to uncover the mysteries of the past.”

The team has said little publicly on whether it plans to excavate the ships — a topic on which nations, academics and treasure hunters have long clashed. Bulgaria is a signatory to the 2001 United Nations convention that outlaws commercial trade in underwater cultural heritage and sets out guidelines on such things as artifact recovery and public display.

Dr. Pacheco-Ruiz said the team had so far discovered and photographed 44 shipwrecks, and that more beckoned.

Which was the most important? Dr. Adams said that for him, a student of early European shipbuilding, the centerpiece was the medieval round ship. He said it evoked Marco Polo and city states like Venice. The ship, he added, incorporated a number of innovations that let it do more than its predecessors had and paved the way for bigger things to come.

“It’s not too much,” he said, “to say that medieval Europe became modern with the help of ships like these.”

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