In 2019, a digital-still camera (front-center) and a fluid- and microbial-DNA sampler RASFLA/PPSDNA, inside a seafloor-frame (back-center), were installed in the International District Hydrothermal Field. A titanium vent cap or “hat” (center-middle) rests on top of a hydrothermal-vent structure covered with microbes. Inside the “hat” are temperature probes and intake nozzles for the fluid and DNA sampler.