From October 29 through November 11 part of my group (including Sebastian Krause, DeMarcus Robinson, David Yousavich, myself), was onboard the RV Atlantis (AT42-19 Expedition) together with a team from UCSB (lead by chief scientist Dave Valentine) and a team from the MPI Bremen/AWI (Frank Wenzhoefer and Felix Janssen). Our goal was to study the seasonal dynamics of giant sulfur bacteria mats in the low- to no-oxygen zone of the Santa Barbara Basin and their coupling to sulfur, nitrogen, and other element cycling. We deployed benthic chambers and microprofilers and collected sediment pushcores with the ROV Jason. We further used the AUV Sentry to map 3D oxygen distribution and other parameters in the water column and to produce a photo mosaic of the mat distribution at the seafloor. We also deployed several casts of CTD/Rosettes and collected a gravity corer. More information about our NSF-funded research can be found here. This was the first of two planned expeditions. We are very grateful for all the support we received on board the Atlantis. The three science teams worked hard and with joy to achieve our project goals.