Deployment of a wide-band OBS in the Gulf of California from the R/V New Horizon in Oct 2005. Seismometer is housed in the green sphere, while recording, power, and communications devices are enclosed in the black cylindrical pressure cases. Instrument sinks to seafloor (1-3 km depth) due to its own weight. After recording for 1 year, the anchor (bottom plate) is released, and instrument returns to surface, driven by buoyancy of glass spheres housed in the yellow cases. Instrumentation was provided by the Scripps Institute of Oceanography's OBS facility, as part of the US National Science Foundation's Ocean Bottom Seismograph Instrument Pool (OBSIP).