Marine researchers have discovered a remarkable underwater site where octopuses live far more socially than ever expected — challenging everything we thought we knew about these solitary creatures. • The site, nicknamed “Octlantis,” was discovered off the coast of Australia. • It consists of dozens of octopus-built dens made from rocks, shells, and debris. • Octopuses were observed living close together, not in isolation. • Researchers documented regular social interactions, including signaling