What was that ship doing by the 2018 lava deltas?

The National Oceanic and Atmospheric Administration Ship Rainier backdropped by its namesake, Mount Rainier, an active Cascade Range stratovolcano in Washington. In September 2019, the Rainier conducted a bathymetric survey along Hawai‘i Island's Puna coast, where lava entered the ocean during Kīlauea Volcano's 2018 eruption. Photo courtesy of NOAA.