Carbonate rock macrofauna collected by HOV Alvin during R/V Atlantis cruise AT50-24 at Sanak Seep Alaska from May 30 to June 6, 2024

Quantitative counts of macrofauna (identified to major taxa) inhabiting authigenic carbonates were conducted at Sanak Seep in the Aleutian Islands (53.74853°N, 162.5889°W) at 2020 meters depth. Rock samples were collected by the HOV Alvin submersible during the R/V Atlantis AT50-24 cruise (Chief Scientist Lisa Levin) at the methane seep site between May 30 and June 4, 2024. Samples were collected using HOV Alvin using the manipulator and were placed in isolated biobox compartments. Samples were preserved and the analyzed at the University of California-San Diego Scripps.