The Japan Agency for Marine-Earth Science and Technology (JAMSTEC) and the Geology Service of Brazil (CPRM) announced Tuesday the discovery of granite at the bottom of the Atlantic Ocean, about 900 miles off the coast of Rio de Janeiro.

Granite, normally found on dry land, suggests that a continent once existed in the region and then sank, much in the same way Plato described, according to The Japan Times.

“South America and Africa used to be a huge, unified continent,” Shinichi Kawakami, a professor at Gifu University told the outlet. “The area in question may have been left in water as the continent was separated in line with the movements of plates.”

Plato wrote that Atlantis was “an island situated in front of the straits which are by you called the Pillars of Hercules,” Reuters notes. During Plato’s time, the Straits of Gibraltar were known as the Pillars of Hercules, so Atlantis-seekers have focused their search in the Mediterranean and Atlantic. (However, others disregard the tale altogether, NTDTV points out.)

CPRM geology director Roberto Ventura Santos emphasizes that his team’s references to the so-called “Brazil’s Atlantis” are mostly symbolic.

“Obviously, we don’t expect to find a lost city in the middle of the Atlantic,” Santos said, according to the Telegraph. “But if it is the case that we find a continent in the middle of the ocean, it will be a very big discovery that could have various implications in relation to the extension of the continental shelf.”

On its website, JAMSTEC states its mission is “to contribute to the advancement of academic research in addition to the improvement of marine science and technology by proceeding the fundamental research and development on marine, and the cooperative activities on the academic research related to the Ocean for the benefit of the peace and human welfare.”

Finding Plato’s actual lost city has been something of a holy grail for many researchers and has spawned several unproven “breakthroughs.”

In 2011, a team of researchers claimed to have found Atlantis buried in mud off the tip of Spain. The ancient city was allegedly flooded by a devastating tsunami, according to PopSci. In 2009, a mysterious, underwater grid pattern on Google Earth was also heralded by some as the lost city; however, Google Earth quickly explained it was a glitch created by sonar boat data collection, Time reported.