Van Dover, C., Colaco, A., Collins, P. Croot, P., Metaxas, A., Murton, B., Swaddling, A., Boschen-Rose, R., Carlsson, J., Cuyvers, L., Fukushima, T., Gartman, A., Kennedy, R. Kriete, C., Mestre, N.C., Molodtsova, T., Myhrvold, A., Pelleter, E., Popoola, S., Qian, P.-Y., Sarrazin, J., Sharma, R., Suh, Y.J., Sylvan, J., Tao, C., Tomczak, M., Vermilye, J.. Research is needed to inform environmental management of hydrothermally inactive and extinct polymetallic sulfide (PMS) deposits. Marine Policy 104183 (https://doi.org/10.1016/j.marpol.2020.104183)