Down in the main lab of the R/V Marcus Langseth, you'll find an array of monitors—46, to be exact!—all displaying information about the data we're collecting. While many of the screens are dedicated to monitoring the seismic data and the instrumentation related to collecting the seismic data, there are two screens that display data related to the multibeam echo sounder. A multibeam echo sounder is an instrument mounted to the hull of the vessel that emits sound waves in a fan shape beneath the ship. The sound waves travel through the water to the seafloor and back to the instrument. The time it takes for the sound waves to return is used to determine the depth of the seafloor, which gives us information on the shape of the seafloor—known as bathymetry. This information complements the deep subsurface imaging provided by the seismic data.