During the VISIONS'13 Expedition, two types of flow meters (CAT and Mosquito) were deployed at the summit of Southern Hydrate Ridge near the Einstein's Grotto active seep site – each instrument has specific ranges of flow that they measure. They will be recovered in 2014, providing year-long records of flow into and out of the sediment. Photo credit: OOI-NSF/UW/CSSF.