A metal sulfide and anhydrite-rich (CaSO4) chimney sprouts from the side of the Escargot edifice with power and communcation housing on the top. Since 2014, temperatures and chlorinity of the super-heated fluids have been measured with this instrument developed by Dr. M. Lilley at the Univesity of Washington. Credit: UW/NSF-OOI/WHOI; V25.