The RAS (Remote Access Sampler) allows time-series temperature measurement in real-time and in situ sampling of hydrothermal vent fluids, while the PPS (Phytoplankton Sampler) allows filtering and preservation of microbial DNA. Thanks to two-way communication via the cabled network, sample bottles can be triggered from shore in response to volcanic or tectonic events.
During Leg 1 of the VISIONS '14 expedition, the RAS-PPS samplers were installed iInternational District 1 Site (MJ03C) in the Axial Caldera.