Figure 9B. Schematic configurations of the instrument package for broadband seismometry. All the equipment in this assembly is accessible to an ROV. Cables from the sensors grouted at ~500 mbsf terminate in a four-way underwater-mateable connector block. The data control unit (MEG) plugs into this connector block. A single output from the top of this package is coupled (by ROV) to the battery/recorder unit (PAT) installed after the sensors are grouted. A data recording unit (SAM) can be retrieved by an ROV when required. MEG = multiple-access expandable gateway. PAT = Power supply access terminal. SAM = storage acquistion module.